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From CompactFlash Association [1]:
COMPACTFLASH is a very small removable mass storage device. First
introduced in 1994 by San Disk [2] Corporation, CF cards weigh a half
ounce and are the size of a matchbook. They provide complete
PCMCIA-ATA functionality and compatibility plus True IDE 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://compactflash.org/info/cfinfo.htm
[2] http://www.sandisk.com/
[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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