This SD to CF adapter allows users to plug any capacity standard Secure Digital or MultiMediaCard (tested up to 4GB) into a device that only accepts CompactFlash. Type II SD to CF Adapter allows you to fully insert the SD card into the adapter so that it may be completely enclosed within a Type II CompactFlash slot. Ensure your device accepts CF Type II (Type II is 5mm thick, whereas Type I is 3.3mm) or IBM Microdrive. True plug and play operation means the Secure Digital SD and MultiMediaCard/MultiMedia Card MMC to CompactFlash card adapter permits you to plug your card directly into a CompactFlash Type II slot and begin transferring files immediately or use the SD-MMC card just as you would normally use a CompactFlash card. Features: Suitable for SD cards up to 4GB capacity (standard SD - not SDHC); Dimensions: 42.8mmx36.4mmx5mm; Data transfer up to 8MB/sec & CompactFlash Type II Compatible.