Two hard drives showing "Invalid" in Disk Management.

[Dream Operator]

I primarily use Vista. Added a TB drive a month ago and rearranged my HDD setup. Life has been great, until today.

I rebooted out of Vista and loaded XP. Found it did not recognize any of my 3 additional HDD's. I went to Disk Management and tried to import them. 1HDD worked, the other two did not. After going back to Vista, I found those two are invalid now. The only option I can do is to convert to basic disc, which wipes the drive. Any suggestions? Thanks in advance.

 

[Dream Operator]

Found a solution!

Test Disk
http://www.cgsecurity.org/wiki/TestDisk

Allowed me to analyze the disk and search for partitions. After finding them, I was able to assign them as Primary. Reboot and correct the drive letters and life is good!