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thasro Level 1 Level 1
I wasn't sure where to post this problem. I'm using SL and I'm trying to format and partition an external hard drive. I get this type of message each time:

Partition failed with the error:

POSIX reports: The operation couldn't be completed. Cannot allocate memory.

After this happens I have to use Windows to initialize the hard drive otherwise my Mac will never see it again. I have tried different formatting/partitioning options but it all ends up the same.

Does anyone know anything about this problem?

Macbook Pro, Mac OS X (10.6)
  • Neville Mayfield Level 4 Level 4
    Did the drive format OK for Mac with Disc Utility before SL or is it a new one? Whatever your answers please include make & model number for the drive. There may still be some manufacturers who have models only suitable for Windows - probably a drive firmware issue.

    If an older drive you could check the manufacturer's website for a firmware update.

  • thasro Level 1 Level 1
    I have never formatted this drive with my Mac or Disk Utility. It's always been with my PC that I don't use anymore. The drive is a Seagate Barracuda, Model: ST3120022A, 120GB 7200RPM. I checked their website and haven't had any luck on finding firmware updates but I did find Windows drivers, but that doesn't help me any. This hard drive is originally an internal hard drive. I have removed it from my PC and put it into an external hard drive enclosure with power supply. I have also check the jumper options and I am sure I have it set to the proper one.
  • Paul2070 Level 1 Level 1
    I have the same problem. In 10.5 I had I/O error, in 10.6 I have error about memory (like yours).
    I tried three different external hard drives and none of them I am able to reformat. I tried all of the possible options: GUID or Apple Partition Map.....

    Is it possible to use something different to reformat a drive? Anything except Disk Utility? Thanks!
  • thasro Level 1 Level 1
    I have tried using Drive Genius, but that didn't work either. It couldn't initialize the drive either.
  • dwb Level 7 Level 7
    Have you tried deleting the partition(s)?
  • thasro Level 1 Level 1
    There are no partitions to delete. Once I try to initialize and format/partition the drive using Disk Utility or Drive Genius the hard drive is totally wiped out. Not even the previous partition is there.
  • crew11 Level 1 Level 1
    Having the same problem with SL. Cannot erase and format drive. Disk Erase failed with the error:

    POSIX reports: The operation couldn’t be completed. Cannot allocate memory

    Bug in SL or any solution? External drive is useless until I can format it.
  • coachglove Level 1 Level 1
    I had my hard drive fail on Wednesday, took my Macbook to the Genius Bar and they replaced it. Got it back today with 10.6 on it and now my laptop will not read my external HD. It was working fine with 10.5, but now when I try and restore from Time machine and copy my music files to my laptop HD, it hangs after a few minutes and says I did not eject my equipment properly.
  • BROOKLYNTREEZ Level 1 Level 1
    'The drive is a Seagate Barracuda, Model: ST3120022A, 120GB 7200RPM. I checked their website and haven't had any luck on finding firmware updates'

    I just found out that a lot of seagate drives have had firmware issues recently. here is a link to see if your drive needs updating. It can only be updated via PC g=en&Hilite=

    click the link at the bottom 'Click here to use the serial number check utility.' and go from there.
  • Neville Mayfield Level 4 Level 4
    To each of the posts in this thread: if you have tried all you know without success as several have you should feed your problems with as much detail as you can to Apple at the case of these compatibility/drive formatting issues).

    At this address your concerns will be read by Apple techs. You are unlikely to get any direct feedback from Apple but they will use your feedback to try to rectify any SL problems they find in an update via Software Update. If they find it is in fact a firmware or other problem with the 3rd-party provider they often contact them and may even assist with provision of an update from the 3rd party. I can affirm that at least one of the issues I have communicated this way was dealt with in a Software Update which came within a few weeks.

    It is important for all to remember that these discussion forums are for users to help each other as much as we can. Some, like myself, have some experience at troubleshooting but not much formal technical expertise, others also have formal technical expertise and can offer more help.

  • kisuke3 Level 3 Level 3
    I am not sure if this will help but it's worth a try since I have not seen anyone post a solution. Try plugging this drive to:

    format the drive as MS-DOS not a quick format but the normal format in drive manager then plug it back to your mac and then reformat it again as mac os extended journaled

    try connecting this drive to a leopard then format it as mac os extended journaled

    if all else fails try to use disk utility in Snow leopard and do a zero out erase
  • TylerDCA Level 1 Level 1
    Add me to the list with this problem.

    The external drive I am trying to format is:

    Mediasonic HUR1-SU2S2 Dual Bay RAID 3.5IN SATA HDD Enclosure USB 2.0 & eSATA Black

    With two Western Digital WD10EADS

    This does not seem to be a Seagate firmware issue.
  • kolella Level 1 Level 1
    same problem on 2 new Iomega UltraMax Pro 2TB eSATA 3Gbits/USB 2.0 units.
  • TylerDCA Level 1 Level 1
    Does anyone know if there is a 3rd party partition utitlity other than iPartition. I would really like to get this drive working and tested (its brand new).

    The iPartition demo looks nice, but its $50. Or if there is any other work around for this problem.
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