rlf Posted October 5, 2013 Share Posted October 5, 2013 I can't believe that I'm the only one so far to experience this. I'm posting this as a warning. I wanted a fresh installation of Mavericks, so I used Maverick's installer Disk Utility to erase my current Mountain Lion partition. For some reason, "Core Storage" kicked in and rearranged the partitions on my hard drive. All I did was select the partition "testOSX" and "erase". So, I tried to re-partition, but the partition pop-up was greyed out. I had to use GPARTED to remove all of the existing partitions before I could use Disk Utility to re-partition the drive. I thought this was a fluke, so I tried a second time and the problem repeated. As a test, I proceeded anyway to install Mavericks and Chameleon to "testOSX" but Chameleon got confused and couldn't boot it. Cleaning up and partitioning/erasing with the Disk Utility in Mountain Lion gave a successful booting installation of Mavericks. Partitions - Before and After "Erasing" The "types" associated with the partitions changed as well. Before 3 TB Hitachi - Media disk0s1 - EFI (hidden) testOSX - Mac OS Extended (Journaled) TM - Mac OS Extended (Journaled) After testOSX - Logical Volume Group testOSX - Logical Partition diskOs1 - EFI (hidden) testOSX - Core Storage Physical Volume (hidden) Boot OS X - Apple Boot Partition (hidden) TM - Mac OS Extended (Journaled) Link to comment Share on other sites More sharing options...
jamiethemorris Posted October 6, 2013 Share Posted October 6, 2013 That's one hell of a bug, unless it's one of Mavericks' new "features..." Thanks for the heads up. I haven't checked to see if it did anything like this to my drive on my mbp. Link to comment Share on other sites More sharing options...
Bongas Posted October 15, 2013 Share Posted October 15, 2013 What can I say, this is probably why my WD my book studio II reset itself after I installled Mavericks GM. All my partitions on that drive lost and it's even reproducible. Bad one! To clarify, I installed Mavericks GM on the internal drive on my Mac mini, after a restart I noticed my external drive had been...ehum...tampered with. Link to comment Share on other sites More sharing options...
digital_dreamer Posted October 15, 2013 Share Posted October 15, 2013 Do you have a Fusion drive setup, or are you using your EFI partition to store the bootloader's /Extra directory? I've seen similar behaviors when a EFI partition is formatted as HFS. Disk Utility displays it like seen above, but I've never seen a partition shown before the EFI partition. Anyhow, the fact that you have a Boot OS X helper partition indicates that your system thinks it has a RAID or Fusion setup. Odd, indeed. Do the following Terminal commands reveal anything?: diskutil cs list or diskutil appleRAID list regards, MAJ Link to comment Share on other sites More sharing options...
Bongas Posted October 15, 2013 Share Posted October 15, 2013 My internal drive is a fusion drive (apples) and the 2 drives in the WD enclosure was setup up as as raid 1. Link to comment Share on other sites More sharing options...
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