SpinRite and ScanDisk are entirely different types of products. ScanDisk replaces the original DOS CHKDSK command, which verified the logical file system structure of the hard drive (the newer CHKDSK command no longer performs that function). Microsoft created ScanDisk because people were switching off their computers without first exiting Windows.
This resulted in corruption of the file system. ScanDisk can also perform a read-only "scan" of a drive's surface to check for any unreadable sectors which it will then remove from use by the file system. However, ScanDisk does not perform data recovery, maintenance, or surface analysis of any kind.
Unlike SpinRite, it does no data pattern testing, defect scrubbing, data relocation or unreadable sector repair and recovery. ScanDisk was never designed to perform those functions. If your hard drives are acting up, the best thing to do is to run SpinRite first (a quick scan at level 2 is fine) to check for and repair any obvious read-trouble ... more.
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