So this was a big build up to a huge let down. Spend two weeks working to piece together enough SA code from different drives to get a working SA for smart hot swap, and it finally worked.
Unfortunately there's a steady repeating pattern of bad sectors across the entire data area consistent with a scratch, so not likely to get any usable amount of data that isn't corrupted.

Unfortunately there's a steady repeating pattern of bad sectors across the entire data area consistent with a scratch, so not likely to get any usable amount of data that isn't corrupted.
