Because flash is , stored data is retained when a device's power source is turned off or lost. CF cards feature construction, which makes them much more rugged than most traditional storage devices. The (basically, what height can you drop them from and have them still work) for CF cards is 2,000 compared to a 100 G to 200 G rating for the mechanical drive of a typical portable computing device. This translates to a drop to the floor from 10 feet vs. a single foot for the mechanical disk drive.
CF cards are self-tested for by member manufacturers of the CompactFlash Association, which was established in 1995. Cards completing this testing are labeled as follows:
There are two main subdivisions of CF cards, 3.3 mm thick type I and 5 mm thick type II (CF2). The type II slot is used by miniature hard drives and some other devices, such as the Hasselblad CFV Digital Back for the Hasselblad series of medium format cameras. There are four main card speeds: original CF, CF High Speed (using CF+/CF2.0), faster CF 3.0 standard, yet faster CF 4.0 standard adopted as of 2007.
CF cards can be used directly in a PC Card slot with a plug adapter, used as an ATA (IDE) or PCMCIA storage device with a passive adapter or with a reader, or attached to other types of ports such as or . As some newer card types are smaller, they can be used directly in a CF card slot with an adapter. Formats that can be used this way include /, Memory Stick Duo, in a Type I slot, and in a Type II slot, as of 2005. Some multi-card readers use CF for I/O as well.
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