Windows – How to mirror a hard drive using Windows 7 Pro

If you have no solid ideas, and no spare parts/computers to test with, then perhaps it's worth paying someone who knows what they're doing to tell you what's wrong?

Having said that, then based on your description and experience, it sounds like your harddrive is dying.

Head over to Western Digital's site and grab their diagnostics utility.

You can test your memory using Windows built in memory test, or something like Memtest86+.

Otherwise, you're going to have to go try and few things and then come back with more specific questions, so that we're not guessing at what's wrong. :)

Also check out these other SU questions (plus I'm sure there are MANY more) for some ideas on what/how to test:

• https://superuser.com/questions/43846/recommendations-for-hardware-diagnostic-software-bootable
• https://superuser.com/questions/104235/what-is-the-best-hardware-diagnostic-for-a-pc
• Computer locking up, looking for bootable hardware diagnostic tool
• When to stop using a hard drive? What rules/software apply?

Did the same: Clone OS to a unallocated partition on the same drive. With Minitool partition Wizard bootable CD -> Copy partition. But to avoid that the clone has the same disk mapping (C: stays C:) I deleted in the registry HKLM\SYSTEM\MountedDevices all Entries except (Default) before cloning. (It may also be done at the first start up of the clone if you cloned before deleting these entries, restart then immediately). This forces the operating system, when fired the first time after the deletion, to remap the drives where C: will be the current OS.

Result on OS1 C: wil be the original C: en D: will be the new OS drive. On OS2 C: will be the cloned OS partition en D: will be the original OS. If D: is not mounted, you can do so in This Computer->Manage->Disk Management yourself.