11 Replies Latest reply: Jun 12, 2013 7:47 AM by chipistickman
chipistickman Level 1 Level 1 (0 points)

When I open disk utilities the erase button is in grey and can't be clicked... I've tried using terminal and disk utilities, I also triede in a pc but it still says that the problem is I don't have write permission. How can I erase everything for good and reformat my usb? is there a program that can do that?

 

Screen shot 2013-06-10 at 9.53.52 PM.png

 

also when I hit verify disk it says it needs to be repaired but still doesn't enables the repari button.

 

Screen shot 2013-06-10 at 10.05.57 PM.png

 

 


iMac, Mac OS X (10.6.8)
  • Topher Kessler Level 6 Level 6 (9,565 points)

    Instead of using the Erase tab, select the Partition tab and choose "1 Partition" from the drop-down menu. Then click the Apply button, and this should repartition the drive and make it available.

     

    If you want the drive to be readable in Windows, then click the Options button and choose "MBR" (Master Boot Record) as the partition type. Then choose "FAT" as the volume format before clicking Apply.

  • chipistickman Level 1 Level 1 (0 points)

    Thanks for the attempt but partition tab makes the same problem that doesn't enables any option....

     

    Screen shot 2013-06-10 at 10.58.16 PM.png

  • chipistickman Level 1 Level 1 (0 points)

    Thanks for the attempt but partition tab makes the same problem that doesn't enables any option....

     

    Screen shot 2013-06-10 at 10.58.16 PM.png

  • Topher Kessler Level 6 Level 6 (9,565 points)

    Open the OS X Terminal utility and run the following command:

     

    diskutil list

     

    Copy and paste the output of this command to a new posting here.

  • chipistickman Level 1 Level 1 (0 points)

    /dev/disk0

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *500.1 GB   disk0

       1:                        EFI                         209.7 MB   disk0s1

       2:                  Apple_HFS WESTGAR                 499.8 GB   disk0s2

    /dev/disk1

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:     FDisk_partition_scheme                        *8.2 GB     disk1

       1:                 DOS_FAT_32 CHIPI 8G                8.2 GB     disk1s1

    /dev/disk2

       #:                       TYPE NAME                    SIZE       IDENTIFIER

       0:      GUID_partition_scheme                        *1.0 TB     disk2

       1:                        EFI                         209.7 MB   disk2s1

       2:                  Apple_HFS WESTGAR EXT             999.9 GB   disk2s2

    Jose-Estradas-iMac:~ JEstrada$

  • Topher Kessler Level 6 Level 6 (9,565 points)

    OK, now run the following command:

     

    diskutil partitionDisk disk1 GPTFormat HFS+ USBDisk 100%

     

    Let me know what the output of this command is, and if afterwards you are able to access the drive in Disk Utility and erase or partition it.

  • chipistickman Level 1 Level 1 (0 points)

    still the same...:

     

     

    Started partitioning on disk1

    Unmounting disk

    Error: 13: POSIX reports: Permission denied

    Jose-Estradas-iMac:~ JEstrada$

  • Topher Kessler Level 6 Level 6 (9,565 points)

    Try the following command instead. This one uses the "fdisk" program to manage the drive instead of diskutil:

     

    fdisk -a hfs /dev/disk1

  • chipistickman Level 1 Level 1 (0 points)

    hey i fell asleep last night sorry! haha this came up in terminal:

     

    Disk: /dev/disk1geometry: 994/255/63 [15974400 sectors]

    Signature: 0xAA55

         Starting   Ending
    #: id  cyl  hd sec -  cyl  hd sec [ start -   size]

    ------------------------------------------------------------------------

    1: 0B0  29  22 -  994  91  57 [  1848 -   15972552] Win95 FAT-32
    2: 000   0   0 -0   0   0 [     0 -      0] unused 
    3: 000   0   0 -0   0   0 [     0 -      0] unused 
    4: 000   0   0 -0   0   0 [     0 -      0] unused 

    Jose-Estradas-iMac:~ JEstrada$

  • Topher Kessler Level 6 Level 6 (9,565 points)

    Ok try the following. In the Terminal run this command:

     

    sudo fdisk -e /dev/disk1

     

    You will see a prompt that looks like the following:

     

    fdisk: 1>

     

    At this prompt, type "auto hfs" and press Enter, and you should see the prompt now look like the following:

     

    fdisk:*1>

     

    Now enter the command "write," and you should see it either say "Writing MBR at offset 0" or give you the following message:

     

    Device could not be accessed exclusively.

    A reboot will be needed for changes to take effect. OK? [n]

     

    If this message appears, type "y" and press Enter, and you will then see the "Writing MBR at offset 0" message. Now enter the command "exit" to quit the fdisk utility, and then unmount your USB drive and reattach it to the computer. At this point you should see a message stating the drive is not readable, with options to initialize, eject, or ignore the issue. Choose Initialize, and you should be good to go.

     

    If the drive is not automatically initialized, you should at least be able to use Disk Utility to now partition and erase it for other uses. If not, then the drive may be corrupt to the point where you cannot repartition it with the Mac. In this case, you can try with a Windows PC or another system, and see if that helps restore the drive, or replace the drive.

  • chipistickman Level 1 Level 1 (0 points)

    Thanks for all the help man... but I think its sadly really gone... hahaha

     

    Screen shot 2013-06-12 at 8.46.14 AM.png