[Macpartners] OS X 10.11.4 diskutil bug: Partition Drive will kill Recovery Partition

[Thomas Brand]

Good morning Duncan,

Does partitioning a disk in 10.11.4 and damaging the Recovery Partition prevent a machine from booting
after FileVault is enabled?

Thomas Brand


On Mon, 28 Mar 2016, Duncan S Kincaid wrote:

> I have noticed the following with OS X 10.11.4 (15E65):
> Partitioning the internal drive using diskutil (command line) or the much loathed 'Disk Utility v. 15.0’ will damage the hidden recovery partition named ‘Recovery HD’ such that one can no longer boot into recovery mode.
> This is true whether one is performing the partitioning from Recovery Mode or from normally booted Macintosh.
> The Macintosh hangs or presents apple.com/support <http://apple.com/support> -30001F when attempting to boot into Recovery Mode after partitioning disk0.
>
> 1. This appears to be the case whether disk0 is formatted CS or not
> 2. This has been confirmed only on disk0 (built-in internal drive). Have not experimented with others.
> 3. This has been confirmed on computers with fresh install of OS X 10.11.4 (both with previous 'Recovery HD' present and with it removed (and re-created by OS X 10.11.4 installer)).
> Recovery Mode works fine until one changes the partition map of disk0.
> 4. Following partition of disk0,  diskutil will still list ‘Recovery HD’ normally, but it no longer works
> 5. restoring the partition scheme to single partition does NOT undo ‘Recovery HD’ damage. it is still hosed.
>
> will file bug with Apple.
>
> dk
>
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> duncan kincaid
> cron | mit school of architecture and planning
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