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Are you using some array structure like JBOD? A decreasing linear speed is normal but not "very slowly" (missing speed indication of you).

I can't close the gap between "asap", "USD 40" in question and not having additional storage media ready.

Thank you for your reply! This is actually an ...

I've searched through the forums and it seems common for large volumes to take days to analyse. I expanded a partition on Wednesday night, only to have it fail to Unallocated space. I need the data back asap and my backups would take days to restore. The TestDisk scan looks like it will take days ...