If, from within our software, a partition looks OK for the disk you are recovering (you see all of the volumes in the Explorer Tree), but Windows still does not recognize a volume, or says "Volume is inaccessible", it is possible that the Partition Boot Sector (or the Boot Sector Copy) is damaged by a virus or overwritten.
You can try to use the Fix Boot Sector command to replace the Primary Boot Sector with its Copy (or vice versa), or you can replace both of them from the set of templates (typical boot sector). The idea is the same as for the Manual Partition Recovery Mode.
You can view a live video-example demonstrating the procedure to fix a Volume Boot Sector at Video Guide: Recovery of inaccessible device.
Important! The Fix Boot Sector command automatically logs the old information to the partition backup file, and you can always rollback the changes later on.
Note: Fix Boot Sector function is available in commercial (purchased) version only.