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A flash drive (also thumb drive, memory stick, and pen drive/pendrive) [1] [note 1] is a data storage device that includes flash memory with an integrated USB interface. A typical USB drive is removable, rewritable, and smaller than an optical disc , and usually weighs less than 30 g (1 oz).
The Memory Stick Micro (M2) measures 15 × 12.5 × 1.2 mm (roughly one-quarter the size of the Duo) with 64 MB, 128 MB, 256 MB, 512 MB, 1 GB, 2 GB, 4 GB, 8 GB, and 16 GB capacities available. The format has a theoretical limit of 32 GB and maximum transfer speed of 160 Mbit/s.
Desktop hard drives can sustain anywhere from 2 to 10 times the transfer speed of USB 2.0 flash drives but are equal to or slower than USB 3.0 and Firewire (IEEE 1394) for sequential data. USB 2.0 and faster flash drives have faster random access times: typically around 1 ms, compared to 12 ms for mainstream desktop hard drives. [18]
Toshiba also used an eight-layer 3D IC for their 32 GB THGBM flash package and in 2008. [58] In 2010, Toshiba used a 16-layer 3D IC for their 128 GB THGBM2 flash package, which was manufactured with 16 stacked 8 GB chips. [59] In the 2010s, 3D ICs came into widespread commercial use for NAND flash memory in mobile devices. [34]
A flash drive is a portable computer drive that uses flash memory. Flash drives are the larger memory modules consisting of a number of flash chips. A flash chip is used to read the contents of a single cell, but it can write entire block of cells. They connect to a USB port [1] and function as a folder.
USB FlashCard is a flash memory card format developed by Lexar, and announced on December 13, 2004. [ 15 ] There is a wide range of existing memory card formats such as SD , xD , and CompactFlash ; the major advantage of USB FlashCard is that the cards are in fact standard USB flash drives . [ 16 ]
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