Please recommend gratis Windows software to check every sector on a hard drive.

I just want read verification for each sector; I don't need write verification.

Can be a GUI app, or run from the command line.

I'm considering just using chkdsk, but I'm wondering if there are better tools that I should consider because they feature any of the following (none are requirements):

  • Improved speed
  • A visual map of any bad sectors/clusters
  • Ability to pause and resume the test

1 Answer 1


I like Ariolic Disk Scanner; it is free and provides read verification with a visual map of the disk showing any bad clusters. It doesn't do repairs, but that was not part of your requirements. You can see this and some other free disk scanners here.

  • 2
    Thanks. It's a nice tool. Plus, it's portable. Note that download is thru CNET, which is a bummer, but not the end of the world. Commented Jul 27, 2018 at 7:11
  • 1
    @RockPaperLizard Yeah, I don't like CNet either, but the Ariolic Disk Scanner is a good tool.
    – Bill W
    Commented Jul 27, 2018 at 14:11

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