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Cannot unmount disk

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Last seen: 6 years 36 weeks ago
Joined: 2011-03-16

I am trying to install OS X 10.4.6 on an iBook.
I am installing from a DVD copy made by the local apple store.

The "Checking your installation DVD" part completes without errors.

During the install it stops and says:
BomFatalError - cpio read error: bad file format
Install failed: some files for BSD may not have been written correctly

I've tried this several times, always with the same error.

In the Disk Utility - First Aid tab, I tried Verify Disk and Repair disk, both which fail with "Could not unmount disk"

I also tried Verify Disk Permission and Repair Disk Permissions, both of which complete successfully.

Then I tried to erase the disk (1 pass), and it says:
Zero Disk failed with error
Could not unmount disk.

What else can I do?

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sounds like a hard drive failure might need to replace it

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