A cache memory is used by operating systems to store frequently accessed data. As the cache memory is a part of the RAM, it is faster to access and retrieve information from the cache memory compared to getting the information or files from the hard disk. In Windows it is possible to increase the performance of a disk cache through a modification of the system registry. Take a backup of the registry before running REGEDIT. Change the values of the LargeSystemCache key in the registry from 0 to 1. This should increase the performance of a disk cache.
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Memory Management.