The CompactFlash Type I (CF Type I) card is a solid-state memory format introduced by SanDisk in 1994, widely adopted in professional digital cameras, camcorders, and industrial devices. Measuring 3.3 mm thick, it is thinner than the 5 mm Type II version, while still offering reliable storage and fast data transfer speeds. CF Type I cards provided capacities ranging from megabytes to several gigabytes, using either flash memory or microdrives. Known for durability and stability, they became a trusted standard in early digital photography.