USB isn't formatting?

Discussion in 'Mac Apps and Mac App Store' started by benjammin82, Jul 9, 2014.

  1. benjammin82 macrumors newbie

    Joined:
    Jul 9, 2014
    #1
    Having trouble formatting a 140GB USB data drive. For starters when the thing is plugged in I get; 'the disk you inserted was not readable by this computer' so I attempt to initialize via disk utility and it won't let be repair or erase the volume. Just says file system formatter failed. Can any one help?
     
  2. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #2
    Maybe its defective?

    Try plugging it into a PC and see if you get a similar response.
     
  3. benjammin82 thread starter macrumors newbie

    Joined:
    Jul 9, 2014
    #3
    No joy on a PC either. Think it's a gonner. Worth a try though.

    ----------

    It's in a 'raw' format which is read only. No idea
     
  4. northernmunky macrumors 6502a

    northernmunky

    Joined:
    Jan 19, 2007
    Location:
    London, Taipei
    #4
    I've had drives that refuse for format in Disk Utility before, easiest way to force solve this is to format it via terminal, use:

    Open Terminal, and type:
    diskutil list


    You'll get a list of attached drives with their partitions like this:
    shousiqiangdaoPro:~ james$ diskutil list
    /dev/disk0
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *1.0 TB disk0
    1: EFI EFI 209.7 MB disk0s1
    2: Apple_HFS Macintosh HD 999.7 GB disk0s2
    3: Apple_Boot Recovery HD 650.0 MB disk0s3
    /dev/disk1
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *500.1 GB disk1
    1: EFI EFI 209.7 MB disk1s1
    2: Microsoft Basic Data G-Drive 500 499.9 GB disk1s2
    shousiqiangdaoPro:~ james$


    Locate the path to your drive (in bold) (and be very careful to get the right disk, I would disconnect any drives you don't want to accidentally erase)
    In my case my G-Drive500 is /dev/disk1

    Then simply type in this format:
    diskutil eraseDisk JHFS+ [NAME YOU WANT DISK TO BE CALLED WITH NO SPACES] [DISK PATH]

    So for me that becomes:
    diskutil eraseDisk JHFS+ G-Drive500 /dev/disk1
     
  5. benjammin82 thread starter macrumors newbie

    Joined:
    Jul 9, 2014
    #5
    Thanks for the help. The result was

    Error: -69877: couldn't open device
     
  6. northernmunky macrumors 6502a

    northernmunky

    Joined:
    Jan 19, 2007
    Location:
    London, Taipei
    #6
    Its fudged!
     
  7. blueroom macrumors 603

    blueroom

    Joined:
    Feb 15, 2009
    Location:
    Toronto, Canada
    #7
    140GB drive sounds like it's pretty old. Good chance it's dying or dead.
     
  8. eljanitor macrumors 6502

    eljanitor

    Joined:
    Feb 10, 2011
    #8
    Bad controller board on the hard drive, or in the USB enclosure most likely.
     

Share This Page