Взгляните на эту ссылку.
Можно интересоваться сначала -d
опция.
Вы могли также попытаться перекомпилировать squid
в cygwin (в setup.exe, установите средства разработки).
In theory such a technique would greatly reduce bandwidth costs, however it would also increase CPU costs. I suggest you have a look at Rsync and see how this tool has solved this problem without the use of hash directories. Also given specific data patters it is possible to have hash collisions where two files would have the exact same MD5 hash. This only becomes a problem if the new and old version of a specific file have the same MD5 hash. It is rare, but it does happen.