external HD says can't be modified when trying to copy stuff.

Discussion in 'Mac Basics and Help' started by SR 7, Apr 7, 2010.

  1. SR 7 macrumors regular

    Joined:
    Apr 30, 2009
    #1
    I bought an external Hard drive and tried copying a video file to it from my mac but it didn't let and it said "drive cannot be modified"

    how do I go about this?
     
  2. old-wiz macrumors G3

    Joined:
    Mar 26, 2008
    Location:
    West Suburban Boston Ma
    #2
    What's the format of the external HD? Is it NTFS? if so you need an add-on for osx to be able to write to it.
     
  3. SR 7 thread starter macrumors regular

    Joined:
    Apr 30, 2009
    #3
    its a regular external hard drive via USB. I didn't do anything to it. I put stuff from a PC and it went on and it works but from my Mac it doesn't.
     
  4. Bacong macrumors 68000

    Bacong

    Joined:
    Mar 7, 2009
    Location:
    Westland, Michigan
    #4
    It's not formatted for Mac, likely. "regular external hard drive" is absolutely meaningless. We need to know the format.

    [​IMG]

    See this? It's the disk utility app in OS X. I have my external drive selected, and it shows the format, which is read and write on both OS X and Windows.
     
  5. old-wiz macrumors G3

    Joined:
    Mar 26, 2008
    Location:
    West Suburban Boston Ma
    #5
    If you can't write to it it is almost certainly NTFS.
     
  6. SR 7 thread starter macrumors regular

    Joined:
    Apr 30, 2009
    #6
    so how do I do taht? where I can read and write on both OS?
     
  7. Bacong macrumors 68000

    Bacong

    Joined:
    Mar 7, 2009
    Location:
    Westland, Michigan
    #7
    Sorry for the late response:

    Open up disk utility app. Select your external on the side, and click "erase" on the right menu. A drop down menu will ask you how you want to format the drive, select MS-DOS.

    As always, reformatting the drive will result in the loss of all data on the drive.
     

Share This Page