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From compactflash.org:
;:CompactFlash is a very small removable mass storage device. First
introduced in 1994 by SanDisk [1] Corporation, CF cards weigh a half
ounce and are the size of a matchbook. They provide complete
PCMCIA-ATA functionality and compatibility plus TrueIDE [2]
functionality compatible with ATA/ATAPI-4. At 43mm (1.7") x 36mm
(1.4") x 3.3mm (0.13"), the device's thickness is less than one-half
of a current PCMCIA [3] Type II card. It is actually one-fourth the
volume of a PCMCIA card. Compared to a 68-pin PCMCIA [4] card, a CF
card has 50 pins but still conforms to PCMCIA [5] ATA specs. It can be
easily slipped into a passive 68-pin Type II adapter card that fully
meets PCMCIA electrical and mechanical interface specifications.
;:CF cards are also available for data storage using the Microdrive.
CF I/O cards are available as modems, Ethernet, serial, digital phone
cards, laser scanners, BlueTooth [6] wireless, etc.
CF first turned up as a storage medium in digital cameras and the
like. Portable devices such as the iPaq use CF I/O cards for
applications such as wireless networking.
Links:
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[1] http://www.sandisk.com/
[2] http://melbournewireless.org.au/?TrueIDE
[3] http://melbournewireless.org.au/?PCMCIA
[4] http://melbournewireless.org.au/?PCMCIA
[5] http://melbournewireless.org.au/?PCMCIA
[6] http://melbournewireless.org.au/?BlueTooth
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