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SanDisk: I 1994 512 GB (CF5 128*2 50 bytes) Thinner (3.3 mm), flash only, now up to 512 GB, although standard goes up to 128 PB since CF 5.0 [2] II Thicker (5.0 mm), older flash, but usually Microdrives, up to 128 PiB [2] CFexpress: CompactFlash Association: 1.0 2017 1 TB
SanDisk co-founder Eli Harari developed the Floating Gate EEPROM which proved the practicality, reliability and endurance of semiconductor-based data storage. [7] In 1991, SanDisk produced the first flash-based solid-state drive (SSD) in a 2.5-inch hard disk drive form factor for IBM with a 20 MB capacity priced at about $1,000. [8]
CompactFlash IDE (ATA) emulation speed is usually specified in "x" ratings, e.g. 8x, 20x, 133x. This is the same system used for CD-ROMs and indicates the maximum transfer rate in the form of a multiplier based on the original audio CD data transfer rate, which is 150 kB/s.
However the SD card, jointly developed by Toshiba, Panasonic and SanDisk, became widely popular among companies and soon became the most popular flash format – by November 2003 it held 42% market share in the United States, ahead of CompactFlash's 26% and Memory Stick with 16%. [7]
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).
They allow adding memory to such devices using a card in a socket instead of protruding USB flash drives. [ 1 ] Common types of flash memory card include SD cards (including microSD), Sony's Memory Stick and CompactFlash .