EXTREME CARD RDR CF TYPE I AND II 30MB/SEC USB The SanDisk Extreme USB 2.0 Reader is the perfect accessory for SanDisk Extreme CompactFlash cards. When coupled with a SanDisk Extreme CompactFlash card, it helps you transfer large files faster through your computer's USB port, at a speed of 30MB/s. It also features the reliability and professional-level services that have become synonymous with the SanDisk Extreme product family.