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Apple Computing Products:
macOS - Operating System
MBP Crashed - cant erase disk - disk erase failed - couldn't unmount disk
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<blockquote data-quote="BSD Meister" data-source="post: 1429449" data-attributes="member: 257388"><p>I think you need to be a little more specific about the steps you're taking.</p><p></p><p>You can't unmount a disk that's in use. Are you using the recovery partition to do the work?</p><p></p><p>The fact that you say that the restore always fails at 0.05% implies to me that the restore is hitting a bad sector on the target drive.</p><p></p><p>I would do the following (if I understand what's going on in your system):</p><p></p><p>1. Boot the recovery disk</p><p>2. When it comes up select the utilities->diskutility</p><p>3. Erase the drive with the "Zero all data" option selected. This will write binary zeros to all sectors on the drive and FORCE the drive to remap any bad sectors to spare sectors, assuming you have them available. All data on the drive being erased will be deleted, needless to say.</p><p>4. Assuming you can do step 3, re-install the OS.</p><p>5. Restore your back ups.</p><p></p><p>You can't use a read only disk for a base operating system disk. The OS needs to be able to write swap files plus about a million other things. A drive seen as read only is effectively a very big CD-ROM - you can read it, but you can't do anything else with it. You CAN however, recover information from it while it's in that mode.</p><p></p><p>Good Luck.</p><p>Hopefully that will work.</p></blockquote><p></p>
[QUOTE="BSD Meister, post: 1429449, member: 257388"] I think you need to be a little more specific about the steps you're taking. You can't unmount a disk that's in use. Are you using the recovery partition to do the work? The fact that you say that the restore always fails at 0.05% implies to me that the restore is hitting a bad sector on the target drive. I would do the following (if I understand what's going on in your system): 1. Boot the recovery disk 2. When it comes up select the utilities->diskutility 3. Erase the drive with the "Zero all data" option selected. This will write binary zeros to all sectors on the drive and FORCE the drive to remap any bad sectors to spare sectors, assuming you have them available. All data on the drive being erased will be deleted, needless to say. 4. Assuming you can do step 3, re-install the OS. 5. Restore your back ups. You can't use a read only disk for a base operating system disk. The OS needs to be able to write swap files plus about a million other things. A drive seen as read only is effectively a very big CD-ROM - you can read it, but you can't do anything else with it. You CAN however, recover information from it while it's in that mode. Good Luck. Hopefully that will work. [/QUOTE]
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Apple Computing Products:
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MBP Crashed - cant erase disk - disk erase failed - couldn't unmount disk
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