Corrupt Filesystem

Hey guys. The other night my laptop froze up on me, and when I went to restart it kept going into the Windows startup repair. Startup Repair wasn't able to fix the problem, which had left me with a drive containing my Win 7 OS and a bunch of data I would like to recover. The drive is a Seagate 320GB SATA, which I have attched to another computer (also running Win 7) using a SATA/USB docking station. Whenever I try to access the drive Windows tells me it needs to be formatted, which I obviously did not do. The HDD has two partitions, a factory recovery partition and the main partition. In Disk Management is shows both partitions as RAW. the main partition comes up as M: in My Computer, but when I try to go into it it shows as empty. Properties on the disk show it as completely full on the pie chart, but says 0 used 0 free space. I have used Testdisk to analyse the drive which has indicated that the NTFS filesystem is missing. Has anybody ever come across an issue like this? Thanks.