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Steve Gibson's SpinRite updated to v6.1, offers benefits to SSDs; free upgrade if you have a license
Hard drive data recovery software
SpinRite rapidly scans spinning or solid-state mass storage media to verify, restore, repair and improve its current readability. Prior to trying SpinRite we were still able to access the drive intermittently but it was impossible to copy data or run a file undelete utility. It ran perfectly, the research assistant who had created the required files copied them off the drive and that was that.
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