SpinRite attempts to recover data from hard disks with damaged portions that may not be readable via the operating system. It analyzes their contents and can refresh the magnetic disk surfaces to allow them to operate more reliably. SpinRite tests the data surfaces of writeable magnetic disks, including IDE, SATA, and floppy disks. Drive interleave has long ceased to be an issue, but SpinRite continued to be developed, now using its remapping as a data recovery tool. SpinRite therefore gained its data recovery and testing capabilities as a side-effect of its original purpose. In changing the drive's interleave, SpinRite needed to be able to remap these physical defects into different logical sectors. At the time SpinRite was designed, hard drives often had a defect list printed on the nameplate, listing known bad sectors discovered at the factory. SpinRite was originally written as a hard drive interleave tool.
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