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Many low-cost MP3 players simply add extra software and a battery to a standard flash memory control microprocessor so it can also serve as a music playback decoder. The actual EEPROM writing and erasure processes are, however, still very similar to the earlier systems described above.

Imation superdisk with encryption serial#

Serial access requires far fewer electrical connections for the memory chips than does parallel access, which has simplified the manufacture of multi- gigabyte drives.Ĭomputers access modern flash memory systems very much like hard disk drives, where the controller system has full control over where information is actually stored. The development of high-speed serial data interfaces such as USB made semiconductor memory systems with serially accessed storage viable, and the simultaneous development of small, high-speed, low-power microprocessor systems allowed this to be incorporated into extremely compact systems. Flash drives are more or less a miniaturized version of this. This required considerable computer support, and PC-based EEPROM flash memory systems often carried their own dedicated microprocessor system. Altering the contents of a particular memory location involved copying the entire field into an off-chip buffer memory, erasing the field, modifying the data as required in the buffer, and re-writing it into the same field.

Hardware designers later developed EEPROMs with the erasure region broken up into smaller 'fields' that could be erased individually without affecting the others. These had very limited capacity, were very slow for both reading and writing, required complex high-voltage drive circuitry, and could only be re-written after erasing the entire contents of the chip. The memory storage was based on earlier EPROM and EEPROM technologies.

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7 Comparison with other portable storageįlash memory combines a number of older technologies, with lower cost, lower power consumption and small size made possible by advances in microprocessor technology.

5.12 Operating system installation media.

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5.6 Windows Vista and Windows 7 ReadyBoost.

5.4 Computer forensics and law enforcement.

5.2 Secure storage of data, application and software files.

Some devices combine the functionality of a digital audio player with USB flash storage they require a battery only when used to play music. USB flash drives draw power from the computer via external USB connection. Most flash drives use a standard type-A USB connection allowing plugging into a port on a personal computer, but drives for other interfaces also exist. The USB connector may be protected by a removable cap or by retracting into the body of the drive, although it is not likely to be damaged if unprotected. Flash drives are very robust mechanically.Ī flash drive consists of a small printed circuit board carrying the circuit elements and a USB connector, insulated electrically and protected inside a plastic, metal, or rubberized case which can be carried in a pocket or on a key chain, for example.

Nothing moves mechanically in a flash drive the term drive persists because computers read and write flash-drive data using the same system commands as for a mechanical disk drive, with the storage appearing to the computer operating system and user interface as just another drive. USB drives with USB 2.0 support can store more data and transfer faster than much larger optical disc drives like CD-RW or DVD-RW drives and can be read by many other systems such as the Xbox 360, PlayStation 3, DVD players and in some upcoming mobile smartphones.

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USB Flash drives use the USB mass storage standard, supported natively by modern operating systems such as Linux, Mac OS X, Windows, and other Unix-like systems. Until approximately 2005, most desktop and laptop computers were supplied with floppy disk drives, but floppy disk drives have been abandoned in favor of USB ports. They are smaller, faster, have thousands of times more capacity, and are more durable and reliable because they have no moving parts. USB flash drives are often used for the same purposes for which floppy disks or CD-ROMs were used. Some allow up to 100,000 write/erase cycles (depending on the exact type of memory chip used) and 10 years shelf storage time. As of September 2011 drives of 256 gigabytes are available, and storage capacities as large as 2 terabytes are planned, with steady improvements in size and price per capacity expected. USB flash drives are typically removable and rewritable, and physically much smaller than a floppy disk.

All the data visible here would fit on a 4 GB flash drive.Ī USB flash drive is a data storage device that consists of flash memory with an integrated Universal Serial Bus (USB) interface.