Adding multiple external HDD's

Discussion in 'Mac Accessories' started by Freeman3030, Aug 31, 2011.

  1. Freeman3030 macrumors newbie

    Apr 10, 2011
    Hi, I've got the basic 21.5" iMac with the 500GB HDD. I've only got 50GB free so was going to turn my old laptops HDD into an external HDD by putting it in an enclosure. No doubt that it will get full before long as it's only 250GB in size. (I take lots of photos and videos) so I have 2 questions.

    1) When my iMacs internal HDD gets full, will the other files I add just spill into the next available HDD? e.g. importing photos into aperture, will it refuse to do it or like I say, spill into the external drive?

    2) I was thinking about getting a 3rd external HDD of quite a large capacity (probably 2 or 3TB) and using time machine to back up all of the external drives I add on as and when I need them. Is it possible to backup data onto one drive that is stored on multiple drives?
  2. SandboxGeneral, Aug 31, 2011
    Last edited: Aug 31, 2011

    SandboxGeneral Moderator emeritus


    Sep 8, 2010
    #1 No it will not automatically spill data over from full HDD to another one. You have to manually tell each application where to save it's files.

    #2 Yes I believe so. You just need to set it up in the Time Machine options. (I'm at work on my Windows machine, so I cannot check to see if this is true right now).

    EDIT: A quick Google search turned up this answer:

  3. spidey3 macrumors regular

    Jul 1, 2010
    Actually, Lion provides CoreStorage - which allows one to span a logical volume across multiple actual partitions, each of which can be on different physical disks. Limitation is that, looking at the documentation, I don't yet see a way to dynamically grow a logical volume by adding more physical volumes to the logical volume group.

    See man diskutil for details on this.


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