![]() That is, it appears to the host device as if it were a hard disk of some defined size and has a tiny IDE controller onboard the CF device itself. In addition to this pinout, in DMA/UDMA transfers from/to new CompactFlash cards, pin 43 is DMARQ (output from CF), pin 44 is DMACK# (input to CF)ĬF cards can be plugged directly to PC Card (PCMCIA) slot with a plug adapter, and with a reader, to any number of common ports like USB or FireWire.ĬompactFlash defines a physical interface which is smaller than, but electrically identical to, the PCMCIA-ATA interface. There are three main speeds of cards including the original CF, CF High Speed (using CF+/CF2.0), and CF3.0 standard.ĬF was among the first flash memory standards to compete with the earlier and larger PC Card (PCMCIA) Type I memory cards, and was originally built around Intel's NOR-based flash memory, though it switched over to NAND. There are two main subdivisions of CF cards, Type I and the slightly thicker Type II cards. The physical format is now used for a variety of devices. ![]() First introduced by SanDisk Corporation in 1994. CompactFlash (CF) was originally a type of data storage device (memory cards or microdrives), usually used in portable electronic devices.
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