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Question: How do recover a corrupt start up file

Mac Book Pro 17 mid 2010


Sierra 10.12.6

how do you recovery corrupt start up file

Mac Pro, macOS Sierra (10.12.6)

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Nov 11, 2017 9:31 AM in response to cptsat In response to cptsat

If you DO have a Trusted Backup, you can risk doing a re-install-in-place. By design, it is not intended to delete any of your stuff . But if your drive is failing, it could wipe out the entire contents of the drive, including ALL your files.


If you do NOT have a Trusted backup, obtain two External drives:

• One to hold a new Install of macOS -- the same version you are running now. If you can get one that is a candidate for replacing your Internal drive, that may be very helpful in the near future.


• One for the Trusted Backup, large (2x to 3x or more than the stuff that needs to be backed up), but do not pay extra for FAST.

Nov 11, 2017 9:31 AM

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Question: How do recover a corrupt start up file