How can I format an external hard drive to be used with Time Machine?

siliana August 13, 2010
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I need to format my Lacie hard drive 500 GB, so I can use it with Time Machine. I want to reinstall the system on my Macbook Pro because when I tried to use Time Machine with this hard drive where I had the previous back up it takes too long. So I think I need to format again the external hard drive.

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  1. Jordan Francis
    August 19, 2010 at 1:54 am

    The first thing you should do when you get a new harddrive is erase it and reformat it. Open up disk utility and find your harddrive list in the sidebar on the left side of the window. Click on the DISK not the DISK IMAGE. The actual disk will be listed first and NOT indented. Then click on the second option from the left, titled "erase". On this page, click the "Format" drop down menu and select either "Mac OS Extended (Journaled)" or "MS-DOS". The former will make your harddrive exclusively work with OS X but will perform better and "MS-DOS" will allowed it to play nicely with either OS X or Windows. Then name your partition in the prompt below.

    After the reformat finishes, you will be able to select it as your Time Machine HDD. Open up Time Machine Preferences and click the "Select Disk" option. Then, click on your Harddrive. It should work no problem.

  2. SoGua
    August 19, 2010 at 1:39 am

    Start your Mac:-
    * Go to Finder -> Application -> Utilities
    * Double click for Disk Utility
    * Select the external Hard Disk you wish to format at the left column
    * Click on the Erase tab
    * At the “Volume Format” select “MS-DOS File System”
    * If you confirm to format your hard disk for mac and windows, Click on “Erase” button.
    * Pop up window will ask to verify the erase procedure. Click the erase button again in the window to start the erase process.
    * All the data in the external hard disk will be permanently removed after this steps.
    * Once the erase process finish, your external hard disk can be use for Time Machine backup purpose.
    * You must make sure your External HDD have a equal or larger space compare to your Macbook Pro

  3. Oron Joffe
    August 18, 2010 at 10:13 pm

    So what is the question?