4GB CompactFlash card, also known as CF Card is a flash memory mass storage device used mainly in portable electronic devices such as cameras Stock Photo - Alamy
SanDisk Extreme 4GB CompactFlash Memory Card Speed Up To 40MB/s- SDCFX — BlueProton
Amazon.com: 4 GB Ultra II Compact Flash Memory Card 15MB/S (SDCFH-004G-A11) 4gb SLR Camera Card : Electronics