At the moment, there are 8 types of memory cards in the market, they are Compact Flash (CF), MicroDrive (MD), Secure Digital (SD), Smart Media (SM), MultiMedia Card (MMC), Memory Stick (MS), Memory Stick Pro and xD-Picture Card. Since different devices may adopt different types of memory cards, an 8-in-1 USB card reader will ensure maximum compatibility



Link: HardwareZoom