During my upgrade from 10.8.5 to Mavericks on my imac I ran into some serious issues. I will try to break it down here:
- The mavericks installation failed, indicated damaged hard drive (a quite common problem, it seems, although there does not seem to be the one solution for it).
- When trying to revert to 10.8, I had problems, with safe mode not running faulty, hard drive repair via disk utility impossible and disk utility suggesting wiping the HD.
- I decided to go ahead and erase the HD and do a clean reinstall.
- Trying to reinstall 10.8 from recovery mode (cmd+r at login, or cmd+alt+r for internet recovery mode) failed. It always suggested to restart the installation.
I do not have a time machine backup - all critical data is saved elsewhere and I do possess a disk image created with superduper on a network drive. Only this does not help in the present situation.
So in lack of a better alternative I created a Mavericks installation partition on a USB HD and tried to clean install Mavericks from there, as described by option 1 here:
During the installation an error occured. Something along the lines of "could not creat recovery HD". I found that some people had overcome this issue by:
a) changing their main partition size to free some space for the creation of a new recovery HD.
I tried this from recovery mode disk utility, it did not have an effect, and I returned to only having one (visible) partition on my HD.
b) using diskutil to wipe the recovery HD and merge it with the main HD partition:
I tried this, but then the step of merging failed, namely (with different names):
diskutil mergePartitions HFS+ MacHD disk0s3 disk0s4
I do not remember the exact error message.
- Both the Mavericks installer on my USB HD and the 10.8 installer in recovery mode refuse to install on my main partition:
"OS X cannot start up from this disk" / "This disk cannot be used to start up your computer"
- Trying to change partitions from Disk utility as described here fails:
Presumably this can be repaired by using diskutil in the right way. Only I have no clue how.
I am slightly distressed by this whole thing and would appreciate any help! :/
The imac is rather new, with no Bootcamp partition or anything nonstandard.
This seems to be the usual fix:
This does not work, as disk utility does not allow me to resize partitions anymore.
Message was edited by: mmand