partition reduced my drive

I tried to increased my windows homeserver from sys drive from 20gb to 185gb, during the reboot I thought it was taken a long time so I shutdown the home server to reboot it again. After reboot, the homeserver sys drive still remain 20gb but my data drive has reduced from 911 to 726. I am missing 160gb and there is no partition on the drive indicating where the 160gb is. How can I recoup my 160gb for my data drive.

Thanks

 

You can try to recover the data by using either

Minitools Partition Wizard to recover the original partition and if that does not work, you can use Minitools Power Data Recovery to find the data that was lost.

http://www.partitionwizard.com/help/partition-recovery.html home edition is free.

http://www.powerdatarecovery.com/free-file-recovery-software/recover-lost-partition.html Free for personal use.

I cannot confirm if these will work on home server though.