Lexar Media's Speed Rated CompactFlash performs at minimum sustained write speeds of 4X, 12X, 40X, and 80X. Lexar Media uses the same rating system as

Lexar Media's Speed Rated CompactFlash performs at minimum sustained write speeds of 4X, 12X, 40X, and 80X. Lexar Media uses the same rating system as the CD-ROM industry where a write speed of 1X equals 150 kilobytes (kb) per second. The higher the speed rating, the faster your camera will be able to store images to the memory card.