I have 4 HDs on my main PC and for some reason, only the C drive is visible upon startup. Each time, I have to go under Control Panel -> Administrative Tools -> Computer Management -> Disk Management and right-click and select "reactivate disk" on any of the 3. Once reactivated, all of them are reactivated and everything works fine, but if I could avoid the hassle of having to do this each startup it would be great. Any idea what might have happened to cause this?