Results 1 to 10 of 10
  1. #1


    Member Since
    Mar 11, 2013
    Posts
    4
    How can i fix an external hard disk that "is no longer readable by this computer"?
    I been having this problem with 2 of my disks ...and other people have it to with no real solution to it. Anyone out there figured this out? This happened after i added the hard disk on another computer (PC)

    Please help!

  2. #2


    Member Since
    Jun 21, 2011
    Posts
    11
    Why not reboot them using disk utilities? "Mac OS Extended (Journaled)" would be the correct format...

  3. #3


    Member Since
    Jan 22, 2010
    Location
    Victoria, BC
    Posts
    20,911
    Specs:
    Mid-2012 MBP (16GB, 1TB HD), Monoprice 24-inch second monitor, iPhone 5s 32GB, iPad Air 2 64GB
    bossen means to say "reformat" them.

    It's hard to say what has happened to those disks, but you imply that they were connected to your Mac and then you moved the to the PC and then moved them back to the Mac. Were they originally formatted for the Mac? If so, I would imagine that connecting them to the PC overwrote (or at least damaged) the directory, which would explain the issue you're having.

  4. #4


    Member Since
    Jun 21, 2011
    Posts
    11
    Just out of interest, isn't reboot and reformat the same thing? I thought so...

  5. #5


    Member Since
    Mar 11, 2013
    Posts
    4
    Hello and thanks for your answer...

    i tried rebooting to Mac OS Extended (Journaled)

    i get the posix error... i get his error with any format!

    The disks were formatted for mac and they were working fine...but when they were connected on PC, (on 2 different PC's at different times), this happened...

    I even tried formatting one of the disks (8 bg lacie usb) on a windows 8 PC but it just took forever and it never really finished the procedure.

    I even tried formatting through the terminal on the mac and still get the same posix error!

  6. #6

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,541
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    Quote Originally Posted by bossen View Post
    Just out of interest, isn't reboot and reformat the same thing? I thought so...
    They are not.

    Generally, "reboot" means to restart your operating system.


    for the op:
    Have you tried connecting them with a different cable?
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  7. #7


    Member Since
    Mar 11, 2013
    Posts
    4
    No i havent...one of them is a small lacie USB it doenst have a cable,...but the other one does...would that make a difference? I am not sure if it accepts a firewire though

  8. #8

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,541
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    Have seen numerous reports of a faulty cable causing a posix error - only reason for suggesting it.

    Could also be that the partition map has been broken if you created &/or formatted additional partitions from Windows.
    You might try this route to see if that can be repaired - link.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  9. #9


    Member Since
    Mar 11, 2013
    Posts
    4
    Hi i am will try your solution , but first check this out

    i tried to reformat my 500 gb hard disk and it managed to do it..but when i tried to eject it it wouldnt work...so i tried to repair it but it didnt work

    check this screenshot out

    imgur: the simple image sharer

  10. #10

    MacInWin's Avatar
    Member Since
    Jul 07, 2008
    Location
    Winchester, VA
    Posts
    6,716
    Specs:
    2015 rMBP, 2008 iMac, iPhone 7, iPad mini, 13" MBP, AppleTV and two MacMinis
    "She's dead, Jim." Unless you have a power supply failing for the external drive, or the cable is bad, the drive has headed south.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. The disk you inserted was not readable by this computer [FIX]
    By KhalaR9 in forum Other Hardware and Peripherals
    Replies: 11
    Last Post: 11-26-2015, 05:46 AM
  2. Replies: 4
    Last Post: 06-09-2013, 11:32 PM
  3. LAcie External USB HDD Isn't "Readable"
    By raeraez in forum Other Hardware and Peripherals
    Replies: 1
    Last Post: 06-08-2010, 04:00 PM
  4. external hard disk "can not be modified".
    By Quantum Flux in forum Apple Desktops
    Replies: 13
    Last Post: 04-15-2010, 06:50 PM
  5. Seagate Freeagent: "The disk you inserted is not readable by this computer"
    By mr_goodbomb in forum Other Hardware and Peripherals
    Replies: 28
    Last Post: 03-08-2010, 11:40 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •