Previous 1 2 Next 27 Replies Latest reply: Jan 14, 2016 8:42 PM by APPLE DREAMER - PC CLINGER Go to original post
  • Grant Bennet-Alder Level 9 (56,691 points)

    Not being able to initialize 4TB Seagate drives in 10.8.4 was acknowledged as a Bug -- that was supposedly introduced when fixing something for Windows, and it broke something in Mac OS X as well.


    I think it is entirely possible this bug goes a bit farther back than 10.8.4. The guy who had this acknowledged as a bug had pressed his case with AppleCare, and they were able to get Engineering to respond and duplicate it and figure out what was up. He was told to expect a patch/software update fix sometime soon, maybe it would make the next update cycle.

  • Ben Smith Level 1 (0 points)

    My Mac Pro has been misbehaving in the same sort of way since 10.8.3 (I think).


    I've had 3TB drives in there for a long time, and they'd always formatted as expected (HFS+, single volumes, no sign of a logical volume etc.). My config:

    Optical drive

    SSD in lower optical bay

    3TB Bay 1

    3TB Bay 2

    3TB Bay 3

    2TB Bay 4


    Since 10.8.3 (I think), I've had the same problem as the original poster. I've got a hunch that it's only happening on machines with an SSD drive installed, though, and that it's the OS/Disk Utility trying to do something clever à la Fusion Drive. Anyone have this problem with a machine that doesn't have an SSD also?

  • ishaktamang Level 1 (0 points)

    I am not professional. I had same problem and i tried whole night to solve this problem but I could not do this. In the morning with frustration I tried to eject my external hard drive and it said miro is using your hard drive you can't eject it. Then I quit miro and tried to repair my hard drive using disk utility; surprisingly it worked. I wonder and don't know how it worked but seriously it worked. I have solved my problem.

  • macsantos Level 1 (0 points)



    I have experienced the same problem that others have here. I have an Intel MacPro in which I recently installed a new internal 3TB hard disk.



    I attempted to format it in Disk Utility under OS X Mountain Lion (10.8) using standard GUID partitioning. But disk Utility formatted it using a Logical Volume Group (LVG) instead of GUID.


    Disk Utility subsequently refused to allow me to reformat or repartition this drive. I thought I was stuck with a LVG drive.


    For the solution that worked for me see the answer by GrowlTiger at AskDifferent

  • Grant Bennet-Alder Level 9 (56,691 points)

    Booting from an older DVD was suggested above. It also works to mount the drive in an external enclosure.

  • macsantos Level 1 (0 points)



    Yes, I read the entire thread, and several others here.


    I tried 10.8.3 and it didn't work in my situation. When booting from 10.8.3 the Partition Layout drop-down was still greyed-out in Disk Utility.


    My solution uses the 10.6 DVD because it's the last universal DVD that is available from 10.6 to 10.8. This was a convenient bootable source for me, and I assumed it would be so for others who don't have multiple bootable copies of historical OS X versions readily available.

  • alanterra Level 1 (55 points)

    Hi Jason. I have been working through this problem with a late 2008 Mac Pro. I haven't talked to Apple, but they would probably also say that it isn't qualified for 4 TB drives.


    Some thoughts.


    1) I have only had this problem (formatting as a Logical Volume Group) for my Seagate Drive. My Western Digital 3 TB internal drives are fine.


    2) There are some workarounds for the problem here and here (either formatting under Snow Leopard or from the command line)


    3) Even if you think that your computer isn't qualified for 4 TB drives, a cheaper solution might be to go get a modern eSATA card (I have a Sonnet) and dock (I have a Thermaltake BlackX Duet), which seem to work for me up to 4 TB. I have found it very hard to determine which docks are qualified for 4 TB drives and which work reliably, but this setup has so far worked for me. (See my comments at for some glitches on the dock).

  • Grant Bennet-Alder Level 9 (56,691 points)

    Even if you think that your computer isn't qualified for 4 TB drives

    The consensus here is that Mac OS X after 10.4.4 does indeed support extremely large drives (including 4TB) provided you can physically plug it into your Mac.


    Apple-acknowleged Bugs have kept it from working properly.


    Apple never endorses what they have not tested themselves, and for models it are not currently shipping, the chances of getting them to regression test something they do not sell has been near Zero.

  • Andries vJ Level 1 (0 points)

    Thanks! This helped me reformat my drive to Journaled HFS+, Awesome!

  • infogeek2 Level 1 (25 points)

    Disk Utility kept formatting my brand new 3 TB hard drive using a Logical Volume Group partition scheme even though I selected the Mac OS Extended (Journaled) GUID partition scheme in the Disk Utility. The Partition Layout dropdown menu under the Partition tab in Disk Utility was grey and unusable. I managed to coax the 3 TB hard drive into GUID Partition format using the command line: diskutil cs delete [hard drive’s Logical Volume Group ID]. I can copy small files to the 3TB hard drive. Copying a file larger than about 30 MB generates error 36 or error 8062 if I copy to the 3 TB hard drive but does not generate any error if I copy the same file to a 2 TB hard drive.


    If I upgrade my OS to Mac OS 10.10 Yosemite will this allow me to use hard drives larger than 2 TB?


    If I split the hard drive into partitions smaller than 2 TB will this avoid I/O errors like error 36 and error 8062?

    3 TB Hard drive Model No.: WDC WD3000FYYZ 7200 RPM. 2 TB Hard drive Model No.: WDC WD2002FAEX, 7200 RPM. Both hard drives connect to a Mac Pro 3,1 (Early 2008) using eSATA cables and an Intel ESB2 AHCI Controller eSATA card.

  • Bob Worthingham Level 2 (295 points)

    Almost 2 years later and the "bug" is still there.  It has not been fixed yet in 10.10.4.  Just tried formatting a 6T drive and it is now a Logical Volume.

  • APPLE DREAMER - PC CLINGER Level 1 (0 points)



    January 14, 2016

    in 2014  I was running Mavericks and I installed a 3 TB Seagate internal hard drive into my early 2009 Mac Pro Tower


    and as with all my new hard drives I always go to disk utility and do a secure Erase  and write a single pass of zeros over the entire drive to get rid of any possible bad sectors and create a clean slate for future diagnostics by technicians 


    by the time the zeroing out process finished the drive was formatted as a logical volume group and everything was grayed out and I was dead in the water


    I took my computer to the Apple Store and they were able to properly formatted and make it work however an interesting thing happened when I do an option start on my Mac Pro tower there are two 3 TB drives listed but I only have one installed  One of the icons is the drive itself the other identical icon is an EFI


    NOW I'M RUNNING YOSEMITE......A few months ago I bought a 7200 RPM Seagate 6 TB and internal hard drive and I was worried about what would happen even though I'm running Yosemite now I was concerned that I would once again be put back into a logical volume group  when attempting to do a secure erase  which is what happened and Yosemite with the 3 TB drive


    I clicked on the partition tab  in Yosemite everything worked fine but my concern is that if I try to do a secure erase of the 6 TB drive itself that it might be formatted as a logical partition group again  and be dead in the water


    Does anybody have any answers regarding this I realize there are steps you can use by accessing disk utility in snow leopard to access partition tab and successfully set up the drive that way but I need to click on the erase tab to do a secure erase


    And the last time I did that I was running Mavericks and a 3 TB drive was formatted as a logical partition group and I was dead in the water but now I'm running Yosemite and I want to know if I try to do a secure erase of my 6 TB internal drive will it once again be formatted as a logical partition group or not


    Note… I was successful partitioning the 6 TB drive on my early 2009 Mac Pro tower with no issues I just want to know if I will have a problem if I try to do a secure erase IN ERASE TAB with this drive running Yosemite which I am running now … I'm just afraid that if I try to do a secure erase IN ERASE TAB with the 6 TB drive that it will be formatted as a logical partition group and everything will be grlayed out and I will be dead in the water like I was with my 3 TB drive when I was running Mavericks when I was trying to do the same secure erase IN ERASE TAB!!!… Not in partition tab !!!


    Neither Apple or Seagate have a convincing and clear answer to this ....I'm sure the definitive answer is out there somewhere.


    What a pain!!!


    Please help if you can


    Thank you very much

  • APPLE DREAMER - PC CLINGER Level 1 (0 points)

    I guess I can more briefly sum up my more lengthy previous post by simply asking the question below


    I have an early 2009 Mac Pro tower


    How can I perform a Secure Erase of a 3 TB (or larger) hard drive (either with or without using the Terminal) in Yosemite without the drive being converted into Core Storage ( or logical volume group)?

    Perhaps it's no longer an issue with Yosemite but in mavericks it was


    Please help


    Thank you

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