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Apple Computing Products:
macOS - Desktop Hardware
'Damage to the Volume Header Block' alert.
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<blockquote data-quote="mac57" data-source="post: 313387" data-attributes="member: 17052"><p>Running Norton is a serious problem! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> Seriously, I would discontinue use of Norton; it is hugely intrusive and provides a lot of this sort of "false positive" error report.</p><p></p><p>In this case, Norton generally makes a copy of the partition table and header blocks of the system disk when it is first installed. It then regularly compares the current contents of those items with its saved copy. If there is any delta, you get the warning you are seeing. This is intended to pick up malware that is inserting itself into your boot sequence. </p><p></p><p>The problem with this is that many legitimate changes can take place in these areas, and unless the previous owner kept Norton up to date, it's saved copy may be badly out of date with the now correct content of your partition table and header blocks. Upgrading Mac OS X might do this, as might repartitioning of the drive itself for any good reason.</p><p></p><p>I would advise the following. (1) get rid of Norton. (2) Use the Mac's Disk Utility to verify the drive (Disk Utility, First Aid, Verify Disk). If Disk Utility reports that all is well, believe it. If it reports trouble, believe that too, and take the appropriate steps to repair it, within the universe of Mac tools vs. within the universe of external systems like Norton.</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="mac57, post: 313387, member: 17052"] Running Norton is a serious problem! :-) Seriously, I would discontinue use of Norton; it is hugely intrusive and provides a lot of this sort of "false positive" error report. In this case, Norton generally makes a copy of the partition table and header blocks of the system disk when it is first installed. It then regularly compares the current contents of those items with its saved copy. If there is any delta, you get the warning you are seeing. This is intended to pick up malware that is inserting itself into your boot sequence. The problem with this is that many legitimate changes can take place in these areas, and unless the previous owner kept Norton up to date, it's saved copy may be badly out of date with the now correct content of your partition table and header blocks. Upgrading Mac OS X might do this, as might repartitioning of the drive itself for any good reason. I would advise the following. (1) get rid of Norton. (2) Use the Mac's Disk Utility to verify the drive (Disk Utility, First Aid, Verify Disk). If Disk Utility reports that all is well, believe it. If it reports trouble, believe that too, and take the appropriate steps to repair it, within the universe of Mac tools vs. within the universe of external systems like Norton. Good luck. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
'Damage to the Volume Header Block' alert.
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