my WD HDD is read only.I can't write!!!

Discussion in 'Mac Basics and Help' started by falconb, Sep 23, 2012.

  1. falconb macrumors member

    Sep 18, 2012
    I'm a new mac user and i know and convinced that it's a great powerful OS

    so i think there is a solution for my problem

    i have an external WD HDD and i can access it very normally
    but the problem is that i cant edit on it because it's "read only" and i tried to make writable but as a new mac user i couldn't

    so please help

  2. GGJstudios macrumors Westmere


    May 16, 2008
    How is the drive formatted?

    Format A Hard Drive Using Disk Utility (which is in your /Applications/Utilities folder)

    Choose the appropriate format:

    HFS+ (Hierarchical File System, a.k.a. Mac OS Extended (Journaled) Don't use case-sensitive)

    NTFS (Windows NT File System)
    • Read/Write NTFS from native Windows.
    • Read only NTFS from native Mac OS X
      [*]To Read/Write/Format NTFS from Mac OS X, here are some alternatives:
      • For Mac OS X 10.4 or later (32 or 64-bit), install Paragon ($19.95) (Best Choice for Lion and Mountain Lion)
      • For Mac OS X 10.5 and later, including Lion, FUSE for OS X
      • For 32-bit Mac OS X, install NTFS-3G for Mac OS X (free) (does not work in 64-bit mode)
      • For 64-bit Snow Leopard, read this: MacFUSE for 64-bit Snow Leopard
      • Some have reported problems using Tuxera (approx $36), which is an enhanced version of NTFS-3G with faster performance.
      • Native NTFS support can be enabled in Snow Leopard and later versions, but is not advisable, due to instability.
    • AirPort Extreme (802.11n) and Time Capsule do not support NTFS
    • Maximum file size: 16 TB
    • Maximum volume size: 256TB
    • You can use this format if you routinely share a drive with multiple Windows systems.

    exFAT (FAT64)
    • Supported in Mac OS X only in 10.6.5 or later.
    • Not all Windows versions support exFAT. See disadvantages.
    • exFAT (Extended File Allocation Table)
    • AirPort Extreme (802.11n) and Time Capsule do not support exFAT
    • Maximum file size: 16 EiB
    • Maximum volume size: 64 ZiB
    • You can use this format if it is supported by all computers with which you intend to share the drive. See "disadvantages" for details.

    FAT32 (File Allocation Table)
    • Read/Write FAT32 from both native Windows and native Mac OS X.
      [*]Maximum file size: 4GB.
    • Maximum volume size: 2TB
    • You can use this format if you share the drive between Mac OS X and Windows computers and have no files larger than 4GB.
  3. hallux macrumors 68030


    Apr 25, 2012
    What ^^ he said...

    Most WD external drives (unless it's a "Mac drive") come formatted for Windows, usually NTFS these days.
  4. falconb thread starter macrumors member

    Sep 18, 2012
    thank you veeeeery much GGJstudios for your help
    and you too hallux

    but what happens if i change the HDD format?
    would the files that it contains get hurt?:cool:

    and also please i want to ask about the "data measuring symbols" you've used cause some of them i didn't understand

    tell me if i'm right or correct
    EiB>>> Exa ???
    ZiB>>> Zetta ???

  5. GGJstudios macrumors Westmere


    May 16, 2008
    Yes, if you format the drive, you will lose any data on it. You should move your data to another drive before you reformat the drive, then move the data back afterwards.
    This will explain:
  6. mankar4 macrumors 6502a


    Aug 23, 2007
    In order to use an ntfs drive on your os x you will need some special drivers. I would recommend you do this only if you plan to use this drive both for your Mac and for a Windows computer. If not, just reformat your drive to HFS+ because that works better with mac that NTFS even when you have these drivers. You could use these to copy your files to your mac, reformat it, then copy them back to the HD.

    Free, slower:
    Cost $, faster:
    Never used before, has a trial period:

    Edit: I just realized GGJ wrote about this above in his long post. Oops.
  7. falconb thread starter macrumors member

    Sep 18, 2012
    thanx GGjstudios
    hahahahahahaha:) mankar4 thank you
    you all helped me pretty good...appreciate that

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