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  1. #1

    Member Since
    Nov 01, 2012
    Exclamation Incorrect formatted external hard drive.....
    I got a Seagate external hard drive and used it on a Windows computer, then tried to use it on my Mac (unsuccessfully). It wouldn't let me drag anything to the disk. The format of the "Expansion Drive" is Windows NT File System (NTFS). How do I format it so that I can use it on my Mac, and will I lose any files from the time I transferred files on the Microsoft computer? Thanks so much!

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Fort Worth, Texas
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    Not a topic for the "Lounge". Moved to correct forum.

    You can reformat the drive by using Disk Utility from the Utilities menu. (Applications -> Utilities -> Disk Utility) Format the drive to Mac OS Journaled.

    But first backup all the files on that drive as formatting will destroy all the data.

  3. #3

    Slydude's Avatar
    Member Since
    Nov 16, 2009
    North Louisiana, USA
    2.8 GHz MacBook Pro 10.11, 8 GB mem, iPhone 6+
    Are you planning to keep using the drive with Windows in addition to with the Mac? If you are don't format it as Mac OS Journaled Windows won't read it.

    If the drive will be used on both platforms you do have some options though:

    1. Format the drive as FAT 32. Both platforms can read this format but each file is limited to less than 4GB.
    2. Mac your Mac write to NTFS drives using third-party software.
    3. I believe both platforms can read drives formated in Ex-Fat.
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