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Backing up drive, requires 4x more space than original drive?

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I'm attempting to back up a 1.5 TB HD that has lost the NTFS.. Before I attempt to recover the partition table I'm trying to back it up on a 2 TB HD but it says it requires at least 6.5 TB to back up..

Any idea why?

Thanks.

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There is probably some information that let's the software believe the disk is bigger. did you try a sector by sector backup?