![]() When I rebooted into 10.8.5 the drive was recognised as a normal volume and I have been using it for my Time Machine backup ever since. ![]() When I restarted my Mac Pro with this Snow Leopard volume I was able to use Disk Utility to set the drive to one partition and GUID format. I did not have a boot volume pre 10.8.4 but did have a Snow Leopard boot volume. However the normal format options were not available with "Logical Volume Group" being the only option. I was running 10.8.5 when I encountered the problem I described above - drive not recognised but Disk Utility did offer to format it. ![]() I am not sure whether the bug is still present in Mavericks. I booted from a Snow Leopard boot drive which I keep on a USB Flash Drive and used Disk Utility to successfully re-format and partition the 3 TB drive. The solution was to boot from an earlier version of OS X. ![]() I Googled the issue and found that 10.8.4 and 10.8.5 have a bug which was causing this problem to occur with drives of 3 TB and greater capacity. I could not set the partition and GUID option and it was not showing the full capacity of the drive. However Disk Utility formatted it as a “Logical Volume Group”. When I rebooted it was not recognised and required formatting. I recently installed a 3 TB drive in a drive bay of my 2008 Mac Pro.
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