All files in the cache are encrypted using 128-bit AES if the flash storage device is removable, but hardware manufacturers can choose to disable encryption on internal, non-removable ReadyBoost devices.Īnd the latest info and most important :Computers with fast hard disks (such as 7,200- or 10,000-RPM disks) might realize minimal performance gains because of the already high disk I/O. SuperFetch monitors files that users access (including system files, application files, and documents) and pre¬loads those files into the ReadyBoost cache. Windows 7 use the Windows SuperFetch algorithm to determine which files should be stored in the cache. Larger caches can improve performance, but the ReadyBoost cache cannot be greater than 4 GB on a FAT32 file system or greater than 32 GB on an NTFS file system. This feature uses external USB flash drives as a hard disk cache to improve disk read perfor¬mance.
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