Sorry if this has been covered before but this problem is diving me mad. Running 64 bit windows 7. using an external seagate freeagent desktop 750GB and a 250GB sata hard drive in a winstar hard drive dock. Boot up and everything works fine. After a period of time - usually about 30mins. both drive cease working even if transfering data. The only way I have found of curing the lockup is to force a closure via the task manager which closes windows explorer. After restarting my computer both hard drives then work again for a few minutes before the problem re-occures. Never had this problem on windows vista! Only started since I did a full installation of windows 7 (not just an upgrade) HELP. This computer is about to take a flying lesson out the bedroom window! Cheers.