The CompactFlash card is the small "chip" in the foreground. These cards are used in digital cameras and are usually available wherever digital cameras are sold. The ATA adapter is required to use the card in the Memory Craft 10000. It also permits the CompactFlash to be inserted in the PCMCIA slot of a laptop computer. To read and write the card on a desktop computer, you will need a "reader/writer."
Buy the smallest size CompactFlash card that you can. Any brands will work, although only SanDisk and Panasonic are guaranteed to work when updating the machine by card. The MC10000 version 2 software will not allow more than 200 designs to be stored in the card, which can easily be done in 8MB. The MC10001 and version 3.0 MC10000s can store up to 1,200 designs on a card. For those models a 128MB card is a good working size.