Encrypting an external USB HDD

Discussion in 'OS X Mavericks (10.9)' started by Appletise, May 4, 2014.

  1. Appletise macrumors member

    Joined:
    Sep 19, 2012
    #1
    my external USB HDD has been made both writeable and readable, I thought encrypting it was easy, I simply right clicked it in “Finder” and chose “Encrypt” put in the pw, but it then has a window that pops up and says: “A GUID Partition Table (GPT) partitioning scheme is required”
    is this correct? If so how do I get the GPT for the external USB HDD? And does it make a difference to me saving files onto it, whether on pc or mac?


    i read http://thetechjournal.com/how-to/tutorial-how-to-encrypt-external-drives-on-mac-os-x-lion.xhtml
    and it says "Step 5: From dropdown menu choose Mac OS Extended (Journaled, Encrypted) and under Name type a name for your drive"

    but l thought it had to be EX FAT to be compatible in both pc and mac? kindly enlighten me

    thanks in advance
     
  2. Weaselboy Moderator

    Weaselboy

    Staff Member

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    Jan 23, 2005
    Location:
    California
    #2
    So you have it in ExFAT format now? To use OS X built in disk encryption it will need to be in Mac OS Extended format. ExFAT won't work.
     
  3. Appletise thread starter macrumors member

    Joined:
    Sep 19, 2012
    #3
    Mac OS Extended format, will that mean that my pc cant read or write on the HDD?

    thanks
     
  4. FreakinEurekan macrumors 68040

    FreakinEurekan

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    Sep 8, 2011
    Location:
    Eureka Springs, Arkansas
    #4
    Correct. If you need both Mac and Windows support, use a 3rd party encryption like TrueCrypt.
     
  5. Appletise thread starter macrumors member

    Joined:
    Sep 19, 2012
    #5
    thanks, so if want to read and write from the pw protected External HDD on a pc, l would need to transfer the files on my PW protected MacOS Extended format HDD onto computer, then erase the HDD and reformat it to EX FAT and transfer it back onto the EX FAT HDD from computer, so the exernal HDD be read and writeable on the pc?
    is it not possible to just protect part of the external HDD, by having it in MacOS Extended format and rest in EX FAT format? l could create a pw disk image with files inside but that could be simply deleted.

    thanks again
     
  6. Weaselboy Moderator

    Weaselboy

    Staff Member

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    Location:
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    #6
    Sure... that would work just fine. Just make two partitions on the disk. One the Mac OS Extended one that you can encrypt and the other an ExFAT partition that is not encrypted and could bee read/write on both systems.
     
  7. FreakinEurekan macrumors 68040

    FreakinEurekan

    Joined:
    Sep 8, 2011
    Location:
    Eureka Springs, Arkansas
    #7
    So can partitions - encryption doesn't prevent against deletion, just against reading.
     

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