If a partition is corrupted in Windows, possible (but not all) symptoms are:
Invalid media type reading drive.
Abort, Retry, Fail?
File system is displayed as "RAW".
Windows may ask if you want to format the drive, such as warning "disk not formatted. do you want to format now?". Such as the follow picture.
File names contain "weird" characters.
"Sector not found" messages.
See solution http://www.icare-recovery.com/raw-drive.html