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  1. #1


    Member Since
    Feb 02, 2010
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    London
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    113
    Specs:
    27" iMac, 13 MacBook Pro, 11" MacBook Air, 64G iPad, iPhone 4
    Formatting SD Cards
    I spent all yesterday trying to get my Garmin satnav to read music on an 8 GByte SD card. 1 GByte cards were recognised but the 8 GByte card was ignored.

    Both cards were formatted as FAT and both were readable on the iMAC when installed in the satnav and then the satnav plugged into the computer. Music copied to both cards OK and the music could be played back on the iMAC - but the satnav itself could not see anything on the 8 GByte card.

    Garmin help was beaten but found the problem last night. Use Disc Utility to format the 1 GByte card and it shows as a FAT device with a FAT partition. Use the same method on the 8 GByte card and it shows as a Mac OS Extended device with a FAT partition - although I select the device and choose FAT.

    To overcome the problem I put the 8 GByte card in my Digital camera, formatted it and then put it in the iMAC to copy the music. Everything worked OK.

    Now to the obvious question. How do I make a proper FAT formatted card in the iMAC?

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,033
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    Now to the obvious question. How do I make a proper FAT formatted card in the iMAC?
    When you format the SD card or any other hard drive to FAT-32 using Disk Utility, always be careful to select the MBR option. Do not let Disk Utility format using the GUID scheme as that will place a small 200 MB EFI partition on the card or drive rendering it useless with some devices.

  3. #3


    Member Since
    Feb 02, 2010
    Location
    London
    Posts
    113
    Specs:
    27" iMac, 13 MacBook Pro, 11" MacBook Air, 64G iPad, iPhone 4
    Thanks for the answer but how. I can't see a way of changing the method in disk utility.

    If I mount a card which was PC formatted it shows as MBR but as soon as I format on the iMac it changes it to GUID and there seems no way to change it.

  4. #4

    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    28,870
    Specs:
    iMac 2010 27" QuadI7 OSX10.11, iMac 2008 OSX10.11, MBP Late2011OSX10.11 , iPad Air, iPhone 3GS
    Which version of OSX? If it's 10.5 or 10.6 in the Partition menu there is an Option button. There you change it to MBR. Select 1 partition and MS DOS format. That is FAT32. Ignore the file sizes. I just did this to show you were the option button is.
    Attached Images Attached Images

  5. #5


    Member Since
    Feb 02, 2010
    Location
    London
    Posts
    113
    Specs:
    27" iMac, 13 MacBook Pro, 11" MacBook Air, 64G iPad, iPhone 4
    Thanks, Found it now. I had been using the erase tab to reformat. Your help is much appreciated

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