I have 7 pro x64. I have one hard drive I use to run windows from, along with a secondary one used to store data. Every time I restart the computer, the secondary hard drive gets hidden. I use Easeus Partition master to unhide the drive. It works perfect until I restart again. I have tried changing registry settings on hiding hard drives, along with the typical built in windows methods to hide/unhide a hard drive. Does anybody have any ideas on what is causing this??