http://walthamstow.london/News/d-drive-unallocated-in-windows/ My sister told me she could not find the D drive in her laptop any more. I felt strange: how could it happen, since all other partitions of the hard drive were visible? So I asked her to restart the laptop, check disk errors. Unfortunately, nothing worked. Guided her to look at the computer management tool, the partition was still there but Windows 7 thought it was unallocated. Fri, 10 Feb 2017 02:07:14 UTC en