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Level 1

4 points

Trying to erase disk on an old imac 2013

How to unmount MacHD? error code-69888

Posted on Apr 30, 2022 9:43 AM

Top-ranking reply

Level 10

81,634 points

Posted on Apr 30, 2022 9:50 AM

Startup in macOS Recovery Mode and use Disk Utility to Erase the disk.

The reinstall the macOS while in macOS Recovery Mode.

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