A great HDD error scanner??

define: Scan

If you're looking for scanning and data recovery then it's hard to beat Spinrite.
If you're just looking for bad blocks than HD Tune might work.
 
badblocks in read-write mode for drives that have no data on them (i.e. before I put them in to service or re-purpose them).

If I think an in-service drive is questionable I give it a pass with badblocks in read-only mode, works just as well as any other tool.
 
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