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#31
Greg, if I understand data recovery a little bit...level 1 is simply matching FAT and DIR tables with what's "green" on the harddrive. My guess Level 2 is finding next-to-green bitsNpieces of recoverable[?] files, and the program uses educated guesses at where the other file pieces are [sector/cluster pointers]. I think Level 3 is TrackByTrack, ClusterByCluster...down to ByteByByte search -- that can take 2-3 weeks on $12grand machines if done by the very few actual data recovery centers.
Home use tools such as MiniTool Power Data Recover can usually do Level 1 pretty effectively, sometimes Level 2 [if one is lucky], I have had no experience with anything approaching level 3 SearchNRescue.
Any of youse guys who like me served with Noah on the Ark, on his computer, remember Windows 3.1 - Windows For Workgroups 3.11 [Dos 3.3 - DOS 6.22] -- Peter Norton's Undelete and Unformat [part and parcel of Norton Utilities for DOS & Windows].