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darduggle Author

Level 1

8 points

Cannot erase hard drive on iMac.

I am trying to erase the hard drive and reinstall OS before selling this iMac. It appears tht thre hard drive was erased but I get an error at the end.

When I try to reinstallOS (Catalina), I get the following error message:

*Erasing “Macintosh HD” (disk2s5) and creating “Macintosh HD”

Preparing to erase APFS Volume content

Checking mount state

The volume “Macintosh HD” on disk2s5 couldn’t be unmounted because it is in use by process 662 (kextcache)

Couldn’t unmount disk. : (-69888)

Operation failed…**

Any idea on what I should do?

Thank you.

iMac Line (2012 and Later)

Posted on Aug 13, 2021 11:45 AM

Best reply

toastosxDC

Level 2

297 points

Posted on Aug 13, 2021 11:54 AM

What OS came with it? The only reason I ask is because if you have to, you reboot and hold down command +option +R and it will let you reinstall from Apples server’s and wipe your machine clean. But it will install the original OS that came with it.

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Cannot erase hard drive on iMac.

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