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It is common for a disk drive to be failing - ie it has a considerable number of bad sectors.  A very high level of recovery can often be achieved, but it is very important that the disk is not stressed any more than necessary.  Experience will also show that typically the area of disk to fail first is the directory area, which is also the most useful area of the disk.  In normal disk reading, it is common to read elements of the directory multiple times, partly to reconstruct directory structure.  The safest way to progress with such a file is to create a file image first, and the intention is to read every sector only once