Windows
7 supports Windows ReadyBoost. This feature uses external USB flash
drives as a hard disk cache to improve disk read performance.
Supported external storage types include USB thumb drives, SD cards,
and CF cards. Since ReadyBoost will not provide a perfor¬mance gain
when the primary disk is an SSD, Windows 7 disables ReadyBoost when
reading from an SSD drive.
External
storage must meet the following requirements:
Capacity
of at least 256 MB, with at least 64 kilobytes (KB) of free space.The
4-GB limit of Windows Vista has been removed.
At
least a 2.5 MB/sec throughput for 4-KB random reads
At
least a 1.75 MB/sec throughput for 1-MB random writes
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