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MS-DOS Help contains the following text about ScanDisk /AUTOFIX:
Fixes damage without prompting you first. By default, if you start ScanDisk with the /AUTOFIX switch and ScanDisk finds lost clusters on your drive, it saves the lost clusters as files in the drive's root directory. To have ScanDisk delete lost clusters rather than saving them, include the /NOSAVE switch. (If you use the /AUTOFIX switch and ScanDisk finds errors, it still prompts you for an Undo disk; to prevent this, include the /NOSUMMARY switch.) You cannot use the /AUTOFIX switch in conjunction with the /CHECKONLY or /CUSTOM switches.
Using the syntax above, ScanDisk does not actually scan the hard disk drivesurface. To force ScanDisk to do so, use the /SURFACE switch in conjunctionwith the /AUTOFIX switch.