External hard Drive not working with time machine?

Discussion in 'Mac Basics and Help' started by macntings, Oct 28, 2014.

  1. macntings macrumors newbie

    Oct 28, 2014
    Hi there,

    I have bought a Seagate expansion portable drive to complete backups using the time machine. For some reason when I try to start a backup using the time machine it fails to do so and I get a message saying:

    "The backup disk is not in MAC OS Extended (Journaled) format, which is required.

    Open time machine preferences and select a different backup disk"

    Does anyone know what I'm supposed to do?

    I am using a Macbook pro OSX 10.8.5. 2.5 GHz, 4Gb ram...

    I would appreciate your help.

  2. Julien macrumors G4


    Jun 30, 2007
    It's probably formatted FAT (as bought) and you need to format as OS Extended (Journaled). Have you formatted it?
  3. satcomer macrumors 603


    Feb 19, 2008
    The Finger Lakes Region
    You bought from a company tha STILL formats for Windows computers. So use /Applications/Utilities/Disk Utility.app to format for OS X.
  4. KLinPA macrumors regular


    Aug 24, 2012
    The external hard drive is probably formatted to work with windows machines. You'll need to use Disk Utility to reformat the external to Mac extended journaled (Mac format) for Time Machine to be able to use it. Disk Utility is built into the Mac's operating system OS X. This article has the steps you need: http://support.apple.com/kb/HT3509 It does say it's for Apeture but it's the same steps for Time Machine.

    Once the external hard drive is formatted correctly, Time Machine will be able to see it and start using it for backups.
  5. macntings thread starter macrumors newbie

    Oct 28, 2014

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