What to Look for in a USB Flash Drive - The Direct Data by yaoyufang


									USB Flash Drive


       A USB flash drive is a NAND-type flash memory data storage device integrated
with a USB (universal serial bus) connector. USB flash drives are typically removable
and rewritable, much shorter than a floppy disk (1-4 inches or 25-102 mm), and weigh
less than 2 ounces (56g). Storage capacities range from 64MB to 16GB or more. Some
allow 1 million write or erase cycles and have 10-year data retention, connected by USB
1.1 or USB 2.0 or both. USB Memory card readers are also available, whereby rather
than being built-in, the memory is a removable flash memory card housed in what is
otherwise a regular USB flash drive, as described below.

                                  USB flash drives offer potential advantages over other
  portable storage devices, particularly the floppy disk. They are more compact, faster,
   hold more data, are more reliable for lack of moving parts, and have a more durable
 design. Additionally, it has become increasingly common for computers to ship without
       floppy disk drives. USB ports, on the other hand, appear on almost every current
 mainstream PC and laptop. These types of drives use the USB mass storage standard,
  supported natively by modern operating systems such as Windows, Mac OS X, Linux
                                                            and other Unix-like systems.

      With nothing being mechanically driven in a flash drive, the name is something of
a misnomer. It is called a "drive" because it appears to the computer operating system
in a manner identical to a mechanical disk drive, and is accessed in the same way.

       A flash drive consists of a small printed circuit board typically in a plastic or metal
casing and more recently in rubber casings to increase their robustness. This makes the
drive sturdy enough to be carried about in a pocket, for example as a key fob, or on a
lanyard. Only the USB connector protrudes, and it is typically protected either by a
removable cap or by retracting into the body of the drive. Most flash drives use a
standard type-A USB connection allowing them to be connected directly to a port on a
personal computer.

www.TheDirectData.com                                                                  Page 1
USB Flash Drive

       To access the data stored in a flash drive, the drive must be connected to a USB
port, either a host controller built into a computer, a USB hub, or some other device
designed to access the data, such as an mp3 player with a USB-in port. Flash drives
are active only when plugged into a USB connection and draw all necessary power from
the supply provided by that connection. Some flash drives, however, especially high-
speed drives, may require more power than the limited amount provided by a bus-
powered USB hub, such as those built into some computer keyboards or monitors.
These drives will not work unless plugged directly into a host controller (i.e., the ports
found on the computer itself) or a self-powered hub.

www.TheDirectData.com                                                              Page 2
USB Flash Drive


First invention and sale

You can assist by editing it now. A how-to guide is available.

Flash drive with retractable USB connector

Several companies claim to have invented the USB flash drive. Trek was the first
company to sell a USB flash drive (Thumb Drive) in early 2000. However, their patent
does not describe the USB flash drive; rather, it describes a very broad family of storage
devices which could include the USB flash drive.

 The Israeli company M-Systems (acquired by SanDisk in November 2006) had been
        working on a USB flash drive since 1998. They registered the domain
www.diskonkey.com on October 12, 1999, indicating their intention to sell a product. In
2000 Dan Harkabi joined the M-Systems team and led the development of DiskOnKey.
The industrial design was done by Ziba and the product won the IDEA award in 2001.
 M-Systems' patent rigorously describes the USB flash drive and its implementation.

An IBM invention disclosure RPS8-1999-0201 by Shimon Shmueli et al. is the earliest
known document to describe the USB-FD accurately and completely, and only the USB-
FD. M-Systems manufactured the DiskOnKey for IBM, which in late 2000 was the first
to sell the product in North America. The IBM 8 MB (8 MiB) USB Memory Key became
available December 15, 2000Shmueli later founded KeyNetica, the first company to
patent and develop the concept that mobile and smart storage devices are all one
needs for mobile computing. Current implementors of the concept are U3 (part of
SanDisk, which also owns the original KeyNetica patent) and Ceedo.

Trek Technology claims it was first to conceive and create the Thumb Drive.

“   "When we first introduced the Thumb Drive in early 2000, we believed that this
    little device was set to change the way consumers across the world would store
    and transport information and data," Trek 2000 Chief Executive Officer Henn
    Tan was quoted as saying. "[Its potential] has made it essential for Trek to         ”

www.TheDirectData.com                                                              Page 3
USB Flash Drive

    invest and protect its intellectual property ownership."

Trek holds patents for the Thumb Drive in Japan, Taiwan, South Korea, the United
Kingdom, New Zealand and Singapore.

Nevertheless, the ownership of the patent for this device has been widely disputed.
According to The Straits Times' report, other companies started marketing similar
devices. M-Systems, which was listed on NASDAQ at the time, called its gadgets
DiskOnKey and Diskey. Electec is M-Systems' importer, and FE Global is its sole
distributor in Singapore. Lexar can also lay claim to a pioneering USB flash drive
product. In 2000 they introduced a Compact Flash (CF) card having an internal USB
function. Lexar offered a companion card reader and USB cable that eliminated the
need for a USB hub.

Trek sued the four companies for infringing its patent. They counterclaimed, asking that
Trek's patent be revoked as it was invalid.

The Singapore Court of Appeal confirmed the validity of Trek Technology's patent for its
Thumb Drive, calling it "novel and inventive" in the decision published in The Straits
Times. The city-state's highest court also quashed the plea of four companies—Israeli
firm M-Systems Flash Disk Pioneers, Electec, FE Global Electronics and Singapore-
based Ritronics Components—and ordered them to stop selling similar devices. The
decision is expected to have a ripple effect on other similar lawsuits which the Trek
group has pending in Britain, Japan and Taiwan. At least one decision in the UK has
addressed similar points as those addressed by the Singapore Court of Appeal, but the
hearing officer reached a different conclusion from that of the Singapore Court of
Appeal, and Trek's patent was revoked in the UK.

Netac Technology of Shenzhen, China also holds a 1999 Chinese and 2004 US patent
on USB flash technology which it has licensed to major manufacturers.

Second generation

Flash drive with retractable USB connector

Modern flash drives have USB 2.0 connectivity. However, they do not currently use the
full 480 Mbit/s the specification supports due to technical limitations inherent in NAND

www.TheDirectData.com                                                              Page 4
USB Flash Drive

flash. The fastest drives currently available use a dual channel controller, although they
still fall considerably short of the transfer rate possible from a current generation hard
disk, or the maximum high speed USB throughput.

Typical overall file transfer speeds are about 3 MB/s. The highest current overall file
transfer speeds are about 10-60 MB/s. older, "full speed" 12 Mbit/s devices are limited
to a maximum of about 1 MB/s.

                                Design and Implementation

One end of the device is fitted with
a single male type-A USB
connector. Inside the plastic casing
is a small printed circuit board.
Mounted on this board are some
simple power circuitry and a small
number of surface-mounted
integrated circuits (ICs). Typically,
one of these ICs provides an
interface to the USB port, another
drives the onboard memory, and
the other is the flash memory.

Essential components

There are typically four parts to a
flash drive:
                                                Internals of a typical flash drive
      Male type-A USB connector
                                                (Saitek brand USB1.1 pictured)
       — provides an interface to
       the host computer.                1 USB connector
      USB mass storage
                                         2 USB mass storage controller device
       controller — implements the
       USB host controller and           3 Test points
       provides a linear interface to
                                         4 Flash memory chip
       block-oriented serial flash
       devices while hiding the          5 Crystal oscillator
       complexities of block-
                                         6 LED
       orientation, block erasure,
       and wear levelling, or wear       7 Write-protect switch
       balancing. The controller         8 Space for second flash memory chip
       contains a small RISC

www.TheDirectData.com                                                                Page 5
USB Flash Drive

       microprocessor and a small amount of on-chip ROM and RAM.
      NAND flash memory chip — stores data. NAND flash is typically also used in
       digital cameras.
      Crystal oscillator — produces the device's main 12 MHz clock signal and controls
       the device's data output through a phase-locked loop.

Additional components

The typical device may also include:

      Jumpers and test pins — for testing during the flash drive's manufacturing or
       loading code into the microprocessor.
      LEDs — indicate data transfers or data reads and writes.
      Write-protect switches — indicate whether the device should be in "write-
       protection" mode.
      Unpopulated space — provides space to include a second memory chip. Having
       this second space allows the manufacturer to develop only one printed circuit
       board that can be used for more than one storage size device, to meet the needs
       of the market.
      USB connector cover or cap — reduces the risk of damage due to static
       electricity, and improves overall device appearance. Some flash drives do not
       feature a cap, but instead have retractable USB connectors. Other flash drives
       have a "swivel" cap that is permanently connected to the drive itself and
       eliminates the chance of losing the cap.
      Transport aid — in some cases, the cap or the main body contains a hole
       suitable for connection to a key chain or lanyard or to otherwise aid transport and
       storage of the USB flash device.

www.TheDirectData.com                                                              Page 6
USB Flash Drive

                            How to Use a USB Flash Drive?

A Flash Drive is a small self-powered drive that connects to a computer directly through
a USB port. It's both Mac and PC compatible, so you can transfer files between both
Macs and PCs. They are supported on all public machines, although some flash drives
require a user to install drivers before use. Flash drives can hold any type of data,
including excel, jpeg, video, and text files. Flash drives are also commonly referred to as
key drive, thumb drives, jump drives, USB drives and pen drives.

Table of Contents:

      Introduction
      Copying Files on PC's
      Formatting drives on PC's
      Copying Files on Mac's
      Formatting drives on Mac's
      Notes and Words of Caution


Flash drives are meant as a way to get files to and from multiple computers. They are
NOT for backups. We strongly encourage users to backup files to CD-RW or CD-R
disks or zip disks.

Please note that not all flash drives are the same. Some may require extra drivers to be
installed on a computer in order for them to function properly. Public computers do not
allow drivers to be installed. Therefore, not all flash drives will be compatible with public

Flash drives come with varying amounts of memory. You may purchase a flash drive
that is approximately the size of a zip disk, or 256MB. Also, you have the option of
purchasing a few 32MB drives instead of a single 256MB drive.

Some of the most popular brand name drives are Lexar, Sandisk, Kingston, PNY, and

Copying files to a flash drive on a PC:

   1. Open My Computer and see which drives are shown. Most computers, for
      example, have a hard disk such as a C: drive and a few removable storage
      devices such as a floppy drive, a CD-ROM drive, and perhaps a zip drive.

www.TheDirectData.com                                                                  Page 7
USB Flash Drive

   2. Insert the flash drive into the USB port and watch to see where the USB flash
      drive appears. Most will appear as removable storage, but some will instead
      appear as hard drives. Note the name Windows is using to refer to the flash drive
      ("Removable Disk (G :)," for example).
   3. Open My Documents or the location from which you want to transfer files to the
      flash drive. Select the files or folders you want to save to the flash drive by left-
      clicking on them. To select more than one, hold down the CTRL key while you
      click and select all of the files you wish to save.
   4. Right-click on the file(s) or folder(s) you selected, then select Send to, then
      select the name you saw appearing in My Computer for the flash drive
      ("Removable Disk (G:)," for example).
   5. When the copying is finished, do not immediately remove the flash drive from the
      USB port. Instead, left-click on the Remove Hardware icon

                            located in the System Tray. A window containing a list of
      the USB devices will appear. Left-click on the Safely Remove Mass Storage
      Device line that matches your flash drive (for example, Safely Remove Mass
      Storage Device - Drive(G:)).
   6. When you see the following message appear in the bottom left toolbar, it is, as it
      says, safe to remove the flash drive from the USB port; you may close the
      message or ignore it, as it will close itself automatically:

Formatting a flash drive on a PC:

   1. Open My Computer.
   2. Right-click on the flash drive and choose Format.
   3. In the Format window, the capacity, file system and allocation unit size should be
      chosen already.
   4. You can check Quick Format, which will clean your drive quickly but not as
      thoroughly. A full format can take up to 10 minutes.

www.TheDirectData.com                                                               Page 8
USB Flash Drive

Copying files to a flash drive on a Mac:

   1. Insert the flash drive into the USB port.
   2. A white USB drive icon will appear on the desktop:

   3. Find the files or folders you want to copy to the flash drive. Select the files or
      folders you want to save to the flash drive by clicking on them. To select more
      than one, hold down the APPLE key while you click and select all of the files and
      folders you wish to save.
   4. Drag and drop the selected files/folders to the white USB flash drive icon.
   5. When you have finished copying, do not immediately remove the flash drive
      from the USB port. Instead, drag the white USB drive icon to the Trash Can,
      located on the Dock. Note: the Trash Can will change to the Eject Icon.

www.TheDirectData.com                                                             Page 9
USB Flash Drive

   6. The white USB drive icon will no longer be visible on your desktop. It is now safe
      to remove the flash drive from the USB port.

Formatting a Flash Drive on a Mac

   1. Go to Go > Applications > Utilities and Open Disk Utility.
   2. Choose your drive from the left panel and then click Erase on the right.
   3. Choose Volume Format, MS-DOS File System will allow the drive to be read on
      Mac's and PC's and a name.
   4. Click Erase.

www.TheDirectData.com                                                            Page 10
USB Flash Drive

Notes and Words of Caution

      Some USB flash drives may require a driver; these models will not work in our
       public lab computers.
      You should be able to take a USB flash drive back and forth between Macintosh
       and Windows computers; however, not all files are compatible with both

www.TheDirectData.com                                                         Page 11
USB Flash Drive

www.TheDirectData.com   Page 12
USB Flash Drive

                                       COMMON USES

1) Personal data transport

The most common use of flash drives is to transport and store personal files such as
documents, pictures and video. Individuals also store medical alert information on
Medical flash drives for use in emergencies and for disaster preparation. Secure
Storage of data, application and software files. With wide deployment(s) of flash drives
being used in various environments, the issue of data and information security remains
of the utmost importance.

2) System administration

Flash drives are particularly popular among system and network administrators, who
load them with configuration information and software used for system maintenance,
troubleshooting, and recovery.

3) Computer repair

Flash drives enjoy notable success in the PC repair field as a means to transfer
recovery and antivirus software to infected PCs, while allowing a portion of the host
machine's data to be archived in case of emergency.

4) Application carriers

Flash drives are used to carry applications that run on the host computer without
requiring installation.

5) To boot operating systems

Most current PC firmware permits booting from a USB drive, allowing the launch of an
operating system from a bootable flash drive. Such a configuration is known as a

While a LiveUSB could be used for general-purpose applications, size and memory
wear make them poor choices compared to alternatives. They are more suited to
special-purpose or temporary tasks, such as:

      Loading a minimal, hardened kernel for embedded applications.
      Bootstrapping an operating system install or disk cloning operation, often across
       a network.
      Maintenance tasks, such as virus scanning or low-level data repair, without the
       primary host operating system loaded.

www.TheDirectData.com                                                               Page 13
USB Flash Drive

6) Windows Vista Ready Boost

In Windows Vista, the Ready Boost feature allows use of some flash drives to
augment system memory.

7) Audio players

Many companies make solid-state digital audio players in a small form factor,
essentially producing flash drives with sound output and a simple user interface.
Examples include the Creative MuVo and the iPod shuffle. While a few of these players
fit the accepted definition of a "true" USB flash drive (including the ability to plug directly
into a USB A socket), the majority require a separate cable. Many of the smallest
players also contain a rechargeable battery, charged from the USB interface.

8) Music storage

Digital audio files can be transported from one computer to another like any other
document, and played on a compatible media player .In addition, many home Hi-Fi and
car stereo head units are now equipped with a USB port. This allows a USB flash drive,
loaded with media files to be played directly.

8) In arcades

In the arcade game In the Groove and more commonly In The Groove 2, flash drives
are used to transfer high scores, screenshots, dance edits, and combos throughout
sessions. While use of flash drives is common, the drive must be Linux compatible,
causing problems for some players.

www.TheDirectData.com                                                                  Page 14
USB Flash Drive


Flash drives are nearly impervious to the scratches and dust that were problematic for
previous forms of portable storage, such as compact discs, ZIP disks, and floppy disks,
and their durable solid-state design means they often survive casual abuse. This makes
them ideal for transporting personal data or work files from one location to another, such
as from home to school or office or for carrying around personal data that the user
typically wants to access in a variety of places. The near-ubiquity of USB support on
modern computers means that such a drive will work in most places.

Flash drives are also a relatively dense form of storage, where even the cheapest will
store dozens of floppy disks worth of data. Many can hold more data than a CD (703
MB). Top of the line flash drives can store more data than a DVD (4.7 GB), and flash
drives with 32 GB storage are now available.

The power consumption of a typical flash drive is very low, much lower than that of the
common alternative, the portable hard disk, due to there being no moving parts inside a
flash drive. Portable hard disks, on the other hand, require several motors or actuators
to rotate the disk platter, and move the read / write head. Consequently, the USB flash
drive need not be as big, or heavy, allowing greater portability.

Flash drives implement the USB mass storage device class, meaning that most modern
operating systems can read and write to flash drives without any additional device
drivers. The flash drives present a simple block-structured logical unit to the host
operating system, hiding the individual complex implementation details of the various
underlying flash memory devices. The operating system can use whatever type of file
system or block addressing scheme it wants. Some computers have the ability to boot
up from flash drives.

Flash drives are much more tolerant of abuse than mechanical drives, but can still be
damaged or have data corrupted by severe physical impacts. Improperly wired USB
ports can also destroy the circuitry of a flash drive, a danger in home-built desktop PCs.

Some flash drives can retain their memory after being submerged in water, even
through a machine wash. Leaving the flash drive out to dry completely before allowing
current to run through it has been known to result in a working drive with no future
problems. Channel Five's Gadget Show cooked a flash drive with propane, froze it with
dry ice, submerged it in various acidic liquids, ran over it with a jeep and fired it against
a wall with a mortar. A company, specializing in recovering lost data from computer
drives, managed to recover all the data on the drive. All the other removal storage
devices, using optical or magnetic discs or semiconductor were completely destroyed.
www.TheDirectData.com                                                                 Page 15
USB Flash Drive


Like all flash memory devices, flash drives can sustain only a limited number of write
and erase cycles before failure. Mid-range flash drives under normal conditions will
support several hundred thousand cycles, although write operations will gradually slow
as the device ages. This should be a consideration when using a flash drive to run
application software or an operating system. To address this, as well as space
limitations, some developers have produced special versions of operating systems or
commonplace applications designed to run from flash drives. These are typically
optimized for size and configured to place temporary or intermediate files in the
computer's main RAM rather than store them temporarily on the flash drive.

Most USB flash drives do not include a write-protect mechanism, although some have a
switch on the housing of the drive itself to keep the host computer from writing or
modifying data on the drive. Write-protection makes a device suitable for repairing virus-
contaminated host computers without risk of infecting the USB flash drive itself.

A drawback to the small size is that they are easily misplaced, left behind, or otherwise
lost. This has led to the common practice of attaching flash drives to key chains,
necklaces and lanyards.

www.TheDirectData.com                                                             Page 16
USB Flash Drive


Flash storage devices are often compared to other common, portable, swappable data
storage devices, such as floppy disks, Zip disks, miniCD / miniDVD, CD-R/CD-RW and
DVD-RW discs.

Floppy DiskOM

Following magnetic tape, the floppy disk was the first popular method of file transport;
but floppies have been almost completely phased out due to their low capacity, low
speed, and low durability. Virtually no new computers include floppy drives, but they do
include USB ports.

However, floppy disks are still being used because of their low cost, are often the
easiest or only way to share files with older systems, are easily bootable, and because
floppy drives can be added to new systems in external or internal forms. As well, office
workplaces have often disabled high volume writable media such as optical drivers and
USB ports to prevent employees from taking large amounts of data, so the small
capacity of the floppy limits the information compromised.

Zip Drive

Attempts to extend the floppy standard were not successful because of a reputation for
unreliability and the lack of a single standard for PC vendors to adopt. The Iomega Zip
drive enjoyed some popularity, but never reached the point of ubiquity in computers.
Also, the larger sizes of Zip—now up to 750 MB—cannot be read on older drives.
Unless one were to carry an external drive, their usefulness as a means of moving data
was rather limited. The cost per megabyte was fairly high, with individual disks often
costing US$10 or more.

Because moving parts are involved and the material used for creating the storage
medium in Zip disks is similar to that used in floppy disks, Zip disks have a high risk of
failure and data loss compared to flash drives. Larger removable storage media, like
Iomega's Jaz drive, had even higher costs for both drives and media, and as such were
not pervasively adopted as a floppy alternative.

Optical Media

CD-R and CD-RW are swappable storage media alternatives. Unlike Zip and floppy
drives, DVD and CD recorders are now common in personal computer systems. CD-Rs

www.TheDirectData.com                                                              Page 17
USB Flash Drive

can be written to only once. But CD-RWs are rated at up to 1,000 erase/write cycles,
and modern NAND-based flash drives often last for 500,000 or more erase/write cycles.

Optical storage devices are generally among the cheapest methods of mass data
storage after the hard drive. However, optical devices are slower than their flash-based

And, compact discs with a 12 cm diameter can be inconveniently large and, unlike flash
drives, cannot fit into a pocket or hang from a key chain. Smaller CD-R media does
exist, such as business card CD-Rs which have the same dimensions as a credit card,
and the slightly less convenient but higher capacity 8 cm CD-Rs. But these are harder
to obtain and generally more expensive than the standard 12 cm version. The small
CDs also require a tray-loading drive; they can cause damage if inserted into a slot-
loading drive.

There also is no standard file system for rewritable optical media. Packet-writing utilities
like Direct CD and In CD exist but produce discs that are not universally readable,
despite their claiming to be based on the UDF standard. The upcoming Mount Rainier
standard addresses this shortcoming in CD-RW media, but it still is not supported by
most DVD and CD recorders or major operating systems. As a result, CDs/DVDs are a
good way to record a great deal of information cheaply and also has the advantage of
being able to put it into any console/optical disk player for playback, but not good for
making ongoing small changes to a large collection of information; flash drives' ability to
do this is their major advantage.


Some flash drives feature encryption of the data stored on them, generally using full
disk encryption below the file system. This prevents an unauthorized person from
accessing the data stored on it. The disadvantage is that the drive is accessible only in
the minority of computers which have compatible encryption software, for which no
portable standard is widely deployed.

Some encryption applications allow running without installation. The executable files
can be stored on the USB drive, together with the encrypted file image. The encrypted
partition can be accessed on any computer running the correct operating system. Other
flash drives allow the user to configure secure and public partitions of different sizes.
Executable files for Windows, Macintosh, and Linux may be on the drive, depending on
manufacturer support. Some security software may require administrative rights on the
host PC to access data.

Newer flash drives support biometric fingerprinting to confirm the user's identity. As of
mid-2005, this was a relatively costly alternative to standard password protection
offered on many new USB flash storage devices. Most fingerprint scanning drives rely
upon the host operating system to validate the fingerprint via a software driver, often
www.TheDirectData.com                                                               Page 18
USB Flash Drive

restricting the drive to Microsoft Windows computers. However, there are USB drives
with fingerprint scanners use controllers that allow access to protected data without any

Some manufacturers deploy physical authentication tokens in the form of a flash drive.
These are used to control access to a sensitive system by containing encryption keys
or, more commonly, communicating with security software on the target machine. The
system is designed so the target machine will not operate except when the flash drive
device is plugged into it. Some of these "PC lock" devices also function as normal flash
drives when plugged into other machines.

All such forms of data protection security involve an increased risk of loss of access to
the data by the legitimate owner/user.

Flash drives present a significant security challenge for large organizations. Their small
size and ease of use allows unsupervised visitors or unscrupulous employees to
smuggle confidential data out with little chance of detection. Equally, corporate and
public computers alike are vulnerable to attackers connecting a flash drive to a free
USB port and using malicious software such as rootkits or packet sniffers. To prevent
this, some organizations forbid the use of flash drives, and some computers are
configured to disable the mounting of USB mass storage devices by ordinary users, a
feature introduced in Windows XP Service Pack 2; others use third-party software to
control USB usage. In a lower-tech security solution, some organizations disconnect
USB ports inside the computer or fill the USB sockets with epoxy.


Recently, "USB flash drive" or simply "UFD" has emerged as the de facto standard term
for these devices. However, the myriad different brand names and terminology used, in
the past and currently, makes UFDs more difficult for manufacturers to market and for
consumers to research. Some commonly used names are actually trademarks of
particular companies, such as Cruzer, TravelDrive, ThumbDrive, and Disgo.

www.TheDirectData.com                                                              Page 19
USB Flash Drive

www.TheDirectData.com   Page 20
USB Flash Drive

www.TheDirectData.com   Page 21
USB Flash Drive

What to Look for in a USB Flash Drive?

USB flash drives come in all shapes, sizes, storage capacities and prices. Before you
purchase a thumb drive, assess your needs and wants. Then choose the drive that best
fits your criteria. Below are the criteria Top Ten REVIEWS used to evaluate USB Flash

      Product Features – USB flash drives should have practical features such as
       retractable USB connectors or swivel caps. The drive may also come with a
       lanyard or keychain or be water resistant.

      Included Software – Some jump drives come with preinstalled applications.
       Common software includes security programs, sync tools and virtual application

      Value – Flash drives vary a lot in price. The best drives for your money offer
       more storage for less money.

      Support/Warranty – Manufacturers should provide first-class customer service
       through online documentation like FAQs or a knowledgebase, and customers
       should be able to reach customer support by phone or email. A lifetime warranty
       ensures you’ll have your drive for years to come.

Why Use a USB Flash Drive?

Practical applications of USB flash drives (also called jump drives, pen drives and
thumb drives):

      Synchronize Computers – Applications allow you to sync computers. Whether
       you’re a student, business personal, someone who enjoys traveling or anyone
       who uses multiple computers. Syncing computers save time and allow you to
       take your work with you.

      Virtual Applications Platforms – You can enjoy your preferences, favorites,
       email and more homes on any computer. None of your personal information is
       stored on the computer so when you’re done, you won’t leave a trace.

      Carry Your Media – You can take your photos, music and videos with you. Many
       photo labs accept USB drives for easy development.

www.TheDirectData.com                                                             Page 22
USB Flash Drive

      Security – USB flash drives can be password protected and the information
       encrypted. You can also use the drive as a key to your computer.
The usb flash drives are     Also they are
available in different       available in
Capacities:                  different Brands:
• 512MB                      • A-DATA
• 1GB                        • PQI
• 2GB                        • Lexar
• 4GB                        • Apacer
• 8GB                        • Sandisk
• 16GB                       • Super Talent
                             • Kingston
                             • RITEK Ridata

www.TheDirectData.com                                                         Page 23
USB Flash Drive

Who needs a flash USB drive? Erik Aldana, vice president of the USB Flash Drive
Alliance, says that the portable drives are perfect for people who regularly work on two
or more different PCs--particularly students and business people--and need a
dependable way to transport data. Flash drives are also popular in Asia, where not
everybody has their own computer.

A 256MB flash drive can hold a surprising amount of data: dozens of digital pictures, a
couple of hours of MP3s, or hundreds of Microsoft Word documents. While they come in
a variety of capacities, ranging from 8MB to 2GB, the 128MB and 256MB models hit the
sweet spot. Lesser capacities are too small to be truly useful, and larger capacities are
prohibitively expensive (2GB drives run about $700). Still, prices will continue to come
down, and we expect drive capacity to hit 4GB by the end of 2004.

In these days of cross-pollinated cell phones, PDAs, and cameras, some may find a
basic flash drive too one-dimensional. If you're looking for convergence, there are USB
drives that also function as MP3 players, voice recorders, and even FM tuners. In fact,
we looked at two USB drives that function as wristwatches and one that doubles as a
pen. Whatever form they take, however, USB drives are pricey storage devices when
you consider the cost per megabyte. You can buy a high-quality 250GB internal hard
drive for around $250, or $1 per gigabyte, whereas a 128MB USB flash drive runs about
$50, or 50 cents per megabyte.

If you're using an older operating system, take note: Most USB flash drives will work
with both Windows and Mac systems, but if you're still using Windows 98, you'll need to
download a driver before you can use the drive. Same goes for Mac fans running
anything older than OS 9.

www.TheDirectData.com                                                             Page 24
USB Flash Drive

Find out how we test USB flash drives.

1. Iomega Micro                   One of the smallest USB flash drives around.

    Verbatim Store Read the     A decent USB flash drive with few extras.
    'n' Go         review
                   Check latest

    Lexar            Read the     Offers useful applications for e-mail, browsing, and
    JumpDrive        review       file synchronization.
    Traveler         Check latest

    SanDisk Cruzer Read the     Durability and a handful of useful preloaded apps.
    Titanium       review
                   Check latest
www.TheDirectData.com                                                           Page 25
USB Flash Drive


    Crucial         Read the     Password-protection, an attractive look, and an
    Gizmo           review       attractive price.
                    Check latest

    Lexar           Read the     A straightforward USB flash drive with few frills.
    JumpDrive       review
    Sport           Check latest

    Iomega Mini     Read the     Iomega's Active Disk technology gives the Mini an
    Drive           review       edge.
                    Check latest

    Apacer Handy    Read the     Solid encryption and compression features.
    Steno USB 2.0   review
    Flash Drive     Check latest

www.TheDirectData.com                                                           Page 26
USB Flash Drive

    Kingston         Read the     Easy to operate and less expensive than other USB
    DataTraveler     review       drives.
                     Check latest

    Meritline Pen    Read the     Pen meets USB flash drive.
    Drive            review
                     Check latest

    Meritline Rist Read the     Wear your USB flash drive as an accessory.
    Memory Watch review
                   Check latest

    Meritline Musix Read the     It bundles a handful of functions in one device.
    5 in 1          review
                    Check latest

www.TheDirectData.com                                                          Page 27
USB Flash Drive

www.TheDirectData.com   Page 28
USB Flash Drive

                               FUTURE DEVELOPMENTS

Semiconductor corporations have worked to reduce the cost of the components in a
flash drive by integrating various flash drive functions in a single chip, thereby reducing
the part-count and overall package cost.

Flash drive capacities on the market are continuously increasing. As of 2007, 64 MB
and smaller capacity flash memory has been largely discontinued, and 128-256 MB
capacity flash memory is being phased out. High-speed is now a standard for modern
flash drives and capacities of up to 64 GB are available.

Lexar is attempting to introduce a USB Flashcards , which would be a compact USB
flash drive intended to replace various kinds of flash memory cards. Pretec introduced a
similar card, which also plugs into every USB port, but is just one quarter the thickness
of the Lexar model SanDisk has a product called SD Plus, which is a Secure Digital
card with a USB connector.

SanDisk has also introduced a new technology to allow controlled storage and usage of
copyrighted materials on flash drives, primarily for use by students. This technology is
termed FlashCP

www.TheDirectData.com                                                               Page 29
USB Flash Drive


      www.google.com.
      www.wikipedia.com.
      www.yahoo.com.
      www.howstuffworks.com
      www.computerhope.com

www.TheDirectData.com                          Page 30

To top