My computer failed to boot a few weeks ago. I took out the C drive and put it in an external drive case on my other computer in order to retrieve outlook emails, bookmarks, etc. The drive is 250 gigs. It only shows an 'N' drive, 130 gigs worth of data, which must have been a partition. The C drive isn't there. Is it corrupted? Will be I be able to retrieve anything from the C drive? If the drive is corrupted, why does one partition show up and not the other?