CompactFlash

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Photo of a CompactFlash memory card, with a GBA Game Pak for scale
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Photo of a CompactFlash memory card, with a GBA Game Pak for scale

CompactFlash cards are generic cards for storing data. They have an ATA block device interface to the host device, and they're usually implemented using either NAND flash memory or a tiny hard disk drive called a Microdrive.

CF was one of the first standards for small (less than credit-card size) portable flash memory storage. It was designed for electrical compatibility with 16-bit PC Card in a smaller form factor.

All CompactFlash memory cards have integrated disk controllers, making them much cheaper to integrate against.

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