Cupertino, CA, USA: Symantec Corporation. ^ 'Norton Utilities for Macintosh Now PowerPC Native, HFS+ Compatible' (Press release).^ 'Apple to Bundle Norton Utilities for Macintosh with New Small Business Mac' (Press release).^ 'SystemWorks 2005 Premier: PC health care'.^ 'Norton Utilities compatibility with various drive technologies'.^ 'Norton AntiVirus 2001, Norton Utilities 2001, Norton CleanSweep 2001 Ensure High Performance Across All Windows Based Systems' (Press release).^ 'Norton Utilities 2000 Makes Computer Maintenance and Repair Easy and Fast' (Press release).^ 'Free Net Nanny Filtering Software Offered with Norton Utilities 4.0 During Six Week On-line Retail Promotion' (Press release).^ 'Symantec Makes Safe Migration to MS Office 2000 Affordable through Special Promotion on Norton SystemWorks, Norton Utilities' (Press release).^ 'Technical support for old versions of Norton Utilities is expired'.^ 'New Norton Utilities 4.0 the Most Effective, Intelligent Problem-Solving Tool Yet' (Press release).^ 'Symantec Hosts Norton Utilities 'Bug-A-Thon' Showdown Between USC and UCLA' (Press release).^ 'Windows 98 Tips and Tricks By Ed Ellers'.^ 'Symantec Announces Norton Utilities 3.0 for Windows 95' (Press release).^ 'How to use Norton Utilities on a home network'.

'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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