# Why is the Mountain Lion Installer unable to complete due to recovery partition problems?

I just bought the Mountain Lion upgrade, but it's unable to complete. When I select my harddrive it says:

Some features of OS X Mountain Lion are not supported for the disk “kollaps”.

Features such as FileVault and Recovery Mode won't be available if you install Mountain Lion on this disk. To learn more, click More Info. To continue with the installation, click Continue.

I continue the installation, but after a reboot and some minutes has passed it claims that it cannot create a recovery partition. The installation aborts.

Here are my partitions:

$diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *750.2 GB disk0 1: EFI 209.7 MB disk0s1 2: Apple_HFS kollaps 498.6 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 4: Apple_HFS Blank 250.6 GB disk0s4  And here's my GUID partition table: $ sudo gpt -r show disk0
start        size  index  contents
0           1         PMBR
2          32         Pri GPT table
34           6
40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
409640   973843192      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
974252832     1269528      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
975522360   489364624      4  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
1464886984      262151
1465149135          32         Sec GPT table


My existing Recovery HD works just fine. I have verified all partitions, and cleaned up file system permissions. In addition I have resized my main partition slightly to make sure the EFI has been recreated (in case it had problems).

Still no go. Do I really have to reinstall the full HD?

WORKAROUND: When I selected the partition "Blank" (disk0s4) as my upgrade partition, the warning dialogue didn't appear. It installed a fresh OSX Mountain Lion on it, and I used the Migration Assistant to copy settings, programs and users from the primary partition. This means that the Recovery HD was not at fault even though the installer claimed that, but I guess something was "wrong" with my primary partition. This solution still isn't a very good one.

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Just an idea: if you ever try this again, when the installation aborts, have a look at the installer log file, accessible via File > Show Log (see support.apple.com/kb/TS1394)... it might contain a bit more information... –  Ashley May 18 '13 at 20:46