Compact Flash memory cards are categorized as Type I and Type II. Type I carries a 3.3mm thickness where Type II carries 5mm. The speed ratings for Compact Flash, usually seen as a "X" rating, utilize the same system used for CD-ROMs and indicates the maximum transfer rate in the form of a multiplier based on the original audio CD data transfer rate, which is 150KB/s. The SanDisk Extreme Pro that we are looking at today carries a 667x speed rating with marketing specifications giving us 100MB/s read and write. The drive is also UDMA7 enabled and conforms to the CFA 6.0 specification, which enables TRIM and transfer speeds up to 167MB/s.
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