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Do you know how the drive was originally partitioned? What does OS X Disk Utility say? I'd attempt recovery via OS X instead of Windows 7. Win7 cannot read OS X partitions, but OS X can read Win7 NTFS/FAT32 partitions. I'd launch Disk Utility in OS X, and see what it says regarding the drive. If it can see the partitions, you may be able to recover data with an app like DiskWarrior.
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