Today, after I restarted my computer, I realise that I have a missing drive in My Computer screen. Although I don't access it all the time, I remember very clearly that there is a Recovery (D:) drive on the My Computer screen all the time, but after the restart, the drive has mysteriously gone missing. I'm now left with only the C: drive.
It appears as though the volume has never existed. When I list the files in diskpart, it appears that the Recovery volume is still around, but it doesn't have a drive letter assigned to it, and probably also the reason why it didn't appear in the My Computer screen(?):
I believe the missing volume was a partition one that came with the factory installation of Windows.
What has gone wrong and how did the partition volume go missing? How can I get it back?
My running on Windows 7.