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  1. #1


    Member Since
    Mar 25, 2007
    Posts
    9
    Lion Upgrade - now external HD wrong format
    Hi there, recently upgraded my OS to Lion and everything seems to have worked smoothly except that one of my external HDs (a Western Digital 2tb My Book) is now showing formatted as "Windows NT Filesystem" and will not mount from disk utility. Verify Disk and Repair Disk do nothing. HD doesn't show in System Profiler.

    Odd thing is that I have an identical HD which didn't change formats and works just fine.

    Anyone have any suggestions on how to format, mount, and access the HD in question?

    Thanks.

    10.7.4
    2.8 Ghz intel Core i7
    16Gb memory

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    49,106
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    A hard drive can not arbitrarily change formats. How were you using the drive before you upgraded to Lion? Did you have an NTFS driver installed so that the drive could be read and written to? Snow Leopard had a built in capability to read and write to NTFS drives but that no longer works in Lion.

  3. #3


    Member Since
    Mar 25, 2007
    Posts
    9
    Thanks chscag. That must be what has happened, the drive had always been formatted this way and now I don't have the immediate capability to access it from the mac. Any suggestions on how I might be able to do so?

  4. #4

    Slydude's Avatar
    Member Since
    Nov 15, 2009
    Location
    North Louisiana, USA
    Posts
    10,462
    Specs:
    2.8 GHz MacBook Pro 10.11, 8 GB mem, iPhone 6+
    You could copy the data to another drive temporarily and reformat it as either Mac OS extended (Mac only) or FAT 32 (Mac and PC). The FAT 32 format is only useful if you are going to be using files that are less than 4 GB.

    Perhaps a better alternative is Paragon NTFS for Mac OS X software. It is not free but will allow you to both read and write to NTFS drives from your Mac so there is no need to reformat.
    Sylvester Roque Former Contributing Editor About This Particular Macintosh

    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  5. #5


    Member Since
    Mar 25, 2007
    Posts
    9
    Awesome, thanks slydude. I'll give Paragon a whirl.

  6. #6

    Slydude's Avatar
    Member Since
    Nov 15, 2009
    Location
    North Louisiana, USA
    Posts
    10,462
    Specs:
    2.8 GHz MacBook Pro 10.11, 8 GB mem, iPhone 6+
    You're welcome. There are a couple of pieces of free software that do the same thing but I can't attest to their reliability.
    Sylvester Roque Former Contributing Editor About This Particular Macintosh

    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  7. #7


    Member Since
    Mar 25, 2007
    Posts
    9
    Yep, Paragon does the trick. Thanks again to all.

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