Partitioned drive, Logical Volume Group, needs to be reformatted. All choices are greyed-out. I ejected the disk, but still got the grey fields. Any suggestions?
Try booting into recovery mode and use Disk Utility to reformat the disk?
Try booting into recovery mode and use Disk Utility to reformat the disk?
A bug in the ERASE function was introduced at 10.8.4. It is unclear whether it has been resolved yet.
Internal drives over 2.2TB were set up as Logical Volume Group when ERASEd, and the rest of the partitioning functions were not yet able to make any changes to that setup.
Solutions include:
• ERASE in an External enclosure (provided it is modern enough to deal with drives over 2.2TB)
• Use Disk Utility from a System or Installer older than 10.8.4, including the 10.6.3 DVD IF your Mac can boot from it.
• Use Terminal commands to ERASE the drive (requires two Terminal windows open and cut and paste the Drive UID between windows)
That did not work. I also started up from a different drive system. Nothing works.
First two are out.
Are the Terminal commands available somewhere?
SnipperJS did the research and posted the solution on this thread:
The essence is:
First run diskutil cs list to get the UDID of the volume group and the logical volume. Then you just delete the volume and the group that was created when Diskutil did the bad 'erase' -- when you do that, your drive will be left with a single large partition and you just don't use Erase after that - use Partition in Diskutil [or go back to Disk Utility] and you'll be all set.
The commands are:
diskutil cs list
diskutil cs deleteVolume <Logical Volume UDID>
diskutil cs delete <logical volume group UDID>
BE WARNED - if you have a fusion drive, this will also show up as a Logical Volume Group and you need to make sure you're picking the right ones or you'll have serious data loss. The command line is unforgiving.
You will need two Terminal windows open to cut-and-paste the huge UDID strings -- one for the Logical Volume, and one for the Logical Volume Group.
.
When I am more awake, I'll give that a whirl.
Thanks
This is the correct way Yes!... I've been at it for days trying to remove this "logical Volume" only to have it pop up again... Is this really a bug? And not a slow roll out from apple..
BTW! This post should be pinned as many people including my mother are getting hosed with this full size virtual drive business.
I never was able to get it resolved. Gave up until I can find someone to help.
I recovered from a similar problem and learned that the logical volume becomes visible when the original boot disk is altered. it's like a failsafe to keep the network from crashing… removing core storage is not an option with your setup.It will go away once the original boot disk is restored.. Best to find a Yosemite USB RestoreHD and reboot while pressing option… If RescueHD become visible, you can make a USB boot disk by dragging it to source under Disk utility then selecting the usb volume or stick it will only go with the correct choice so that should boot up you mack pro to the screen that will let you restore your drive and keep the files also…. I think the original disk names end up renaming themselves as they where after the usb resore also.. Good luck
Partitioned drive, Logical Volume Group, needs to be reformatted
