'About MS-DOS Defragmenter' also states, 'Technology from the Norton Utilities' ^ Upon executing the DEFRAG command in MS-DOS 6.22, the message: 'Microsoft Defrag for MS-DOS Copyright 1988-1993 Symantec Corporation' is displayed.^ Upon executing the UNDELETE command in MS-DOS 6.22, the message: 'UNDELETE - A delete protection facility Copyright (C) 1987-1993 Central Point Software, Inc.' is displayed.^ 'PERSONAL COMPUTERS A Remarkable Disk Doctor'.Also Norton eventually abandoned Disk Doctor as they didn't really understand how it worked so couldn't actually support it for users. He claimed proof in that random numbers he generated for BIOS checking were left unchanged in Disk Doctor presumably because Norton's software engineers didn't know their purpose. This, he says, occurred after he refused to accept Peter Norton's bid to purchase SpinRite from him. ![]() In June 2018 Steve Gibson alleged in his weekly podcast 'Security Now!', that Norton's Disk Doctor was not created by Norton but instead was reverse engineered from his ubiquitous SpinRite software without permission or attribution.
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