Bad Sectors Handling
An error was encountered during a sector block read operation.
Sectors are read in chunks of 16 sectors. If this operation fails this might be because of a single bad sector or of several bad sectors. You have the choice:
Skip sector block
All 16 sectors are considered bad. No attempt is made to retrieve possibly good sectors.
Retry accessing single sectors
The program retries reading the sectors one by one. This gives the chance to retrieve possibly good sectors in the neighborhood of a bad one. However, this can be very time consuming, especially if there are not good sectors at all.