Help with Western Digital External HD

Discussion in 'Mac Basics and Help' started by MacGeek7, Jun 16, 2008.

  1. MacGeek7 macrumors 6502a


    Aug 25, 2007
    I purchased a Western Digital External HD which arrived today and I've been trying to erase it and reformat it for Mac instead of the Fat-32 for Windows. However, it just won't work. I plan on using it for Time Machine and I'm not sure if I trust a Windows formatted HD for my backups/other data.
    I'm not stupid with it comes to things like this but I just cannot for the life of me figure out why it won't work. I attached a screen shot of the error - thanks in advance

    Attached Files:

  2. blodwyn macrumors 65816

    Jul 28, 2004
    Portland, Oregon
    OK, I'm dredging my memory back to when I had a problem like this a while ago. I seem to remember finding a post somewhere that had something like the following...

    Use disk utility to partition the disk into two partitions. For the first partition choose 'GUID' under the options. Having done this you go back to one partition and you should be able to format as HFS+

    Edit: This post may help
  3. velocityg4 macrumors 68040


    Dec 19, 2004
    Or just simply go to partitions in disk utility. Open the partitions tab and select one partition then choose Mac OS X extended Journaled and click erase (format/partion I do not remember which word is used at the moment).
  4. merl1n macrumors 65816


    Mar 30, 2008
    New Jersey, USA
    This won't work. If this is a new WD drive, it came pre-formatted for Windows (Master Boot Record).

    In order to format it for the (intel) mac, you are correct that he uses Disk Utility, but one step is missing.

    Select the actual device in the left column and click the "Partitions" tab.
    Change "Current" to "1 Partition" (this enables the Options button)
    Click the Options button and change the partition mapping to GUID. Click OK
    Name the Disk and click the Apply button below.

    This will reformat the drive and make it ready for Time Machine backups.

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