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So I removed the disk and connected it externally to another machine. Disk Management sees both the primary and secondary partition and says they're both healthy. Explorer can only read from the second. The first comes up but can't be read.


I'm sure you already have but did you try and run chkdsk on it? Last time this happened to me I spent hours trying to access the drive with various utilities, in the end I gave up and re-installed. I now back up everything on my C drive to another drive.