I have a Seagate 750GB SATA HDD that I need to recover data from. The HDD powers up fine and when connected to my computer via SATA to USB Converter Windows will list the Drive letter in "My Computer" but I cannot connect to it. I'm prompted to "Format the HDD before I can use it" message. I have tried using TestDisk but TestDisk tells me that the file system is corrupt. Is there anything else that I can use to fix the corrupt file system to recover my data? Is there something in TestDisk that I can try to fix the corrupt file system? I tried running a chkdsk from command prompt but I get a message that the drive is in a RAW format and that chkdsk does not except that RAW format.