External HD error

Discussion in 'MacBook Pro' started by roarr, Sep 13, 2011.

  1. roarr macrumors newbie

    Sep 13, 2011
    I'm not sure if this is in the right section but I'll give it a go anyway because I need some help!

    I have a 1.5TB external hard drive and a 13i macbook pro. I've never had any problems with it until my friend just tried to use it to copy some of the stuff i have on there.

    Now whenever I try to use it it comes up with this error:

    "NTFS-3G could not mount /dev/disk1s1 at /Volumes/External 1.5TB because the following problem occurred:
    ntfs_attr_pread_i:ntfs_pread failed: input/output error
    failed to read NTFS $Bitmap: Input/output error NTFS is either inconsistent or there is a hardware fault or it's a SoftRAID/fakeRAID hardware.
    In the first case run chkdsk/f on windows then reboot windows twice.
    THe usage of the /f parameter is very important!
    If the device is a SoftRAID/FakeRAID then first activate it and mount a different device under the /dev/mapper/directory (e.g. /dev/mapper/nvidia_eahaabcc1).
    Please see the 'dmraid' documentation for more details. "

    I've had a look on some other forums and can't find out how to fix this... can anyone help?

  2. Prodo123 macrumors 68020


    Nov 18, 2010
    Drive corruption, most probably caused by:
    1. Drive failure
    2. Physical shock
    3. Heavy fragmentation (very unlikely)

    Like it says, go on Windows through Boot Camp and run chkdsk on it. Mac OS X is not very friendly to NTFS, which your drive uses, so you will be better off running diagnostics on the hard drive on Windows.

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