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is a data storage device that includes flash memory with an integrated USB interface. USB flash drives are often used for the same purposes for which floppy disks or CDs were once used; i.e.

It is typically removable, rewritable and much smaller than an optical disc. for storage, data back-up and transfer of computer files.

Typically, one of these ICs provides an interface between the USB connector and the onboard memory, while the other is the flash memory.

Drives typically use the USB mass storage device class to communicate with the host.

Pua Khein-Seng from Malaysia is considered by many to be the "Father of Pen Drive".

He is notable for incorporating the world's first single chip USB flash controller. Pua founded Phison Electronics based in Taiwan with four other partners and is believed to have produced the world's first USB flash drive with system-on-chip technology.

The memory storage was based on earlier EPROM and EEPROM technologies.

Additionally, they are immune to electromagnetic interference (unlike floppy disks), and are unharmed by surface scratches (unlike CDs).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, Play Station 3, DVD players, automobile entertainment systems, and in a number of handheld devices such as smartphones and tablet computers, though the electronically similar SD card is better suited for those devices.A 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 rubberised case, which can be carried in a pocket or on a key chain, for example.and had a storage capacity of 8 MB, more than five times the capacity of the then-common 3½-inch floppy disks (of 1440 KB).In 2000, Lexar introduced a Compact Flash (CF) card with a USB connection, and a companion card read/writer and USB cable that eliminated the need for a USB hub.

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