If you find that one of your drive's file system has been changed to RAW, do not run 'CHKDSK' for repair as often recommended. 'CHKDSK' will repair a corrupt partition table in most cases. But if this doesn't happen, you run the risk of losing data on the drive. Stellar Phoenix Partition Recovery 7.0 can be a far more reliable option here. The software allows searching for lost or deleted partitions on your Windows-based drives and helps you recover data from RAW External drives as well 'lost' volumes.
For recovering lost logical volumes using Software, follow the given procedure: