Need help with defrag

Discussion in 'Community Discussion' started by dne416, May 19, 2011.

  1. dne416 macrumors newbie

    Mar 24, 2011
    Can anyone help me with this problem please

    I get this message everytime I try to do a full defrag on iDefrag

    You cannot use this algorithm on the selected volume. Off-line algorithms need to unmount the disk so you need to boot from a different disk, partition, computer or CD/DVD. Alternatively, use the Quick (on-line) algorithm.
  2. maflynn Moderator


    Staff Member

    May 3, 2009
    Are you trying to defrag your system volume that you booted up? If so you need to boot off a different device or disk. You cannot defrag the disk that was used to start up OSX
  3. dne416 thread starter macrumors newbie

    Mar 24, 2011
    I'm just trying to compile back the data together because I cannot partition more than 30 gb for windows and I need more data partitioned even though I have 90gb free. I tried quick-online defrag but it didn't do anything but just wait my time. It didn't combine the data after it was done.

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