Disk Utility RAID hates me -- two external drives

Discussion in 'Mac Basics and Help' started by Zakster82, Oct 21, 2010.

  1. Zakster82 macrumors newbie

    Oct 20, 2010
    Hi all,

    I recently bought two identical 3TB Seagate USB drives. I have them connected to my Mac Mini and I want to set them up on RAID mirroring for my iTunes library. This is solely for the purposes of protection against a failed disk--I know the caveats regarding mirroring vs backup.

    However every time I try to create the array in Disk Utility, I get "POSIX reports: the operation couldn't be completed. Operation not permitted." Any ideas, or at least advice where I can get more diagnostic information?

  2. ksbarnz macrumors newbie

    Jul 27, 2010
    Hi, did you figure out a solution to the problem? I am having the same problem with the exact same drives. I am about to re-format them and write the drives with zeros but that will take over 20 hours per drive.
  3. j3r3my macrumors newbie

    Apr 18, 2011
    Same problem - cannot find an answer

    I've the same problem - and cannot find an answer.
    Forums, Seagate etc
    So my question is - what drives can anyone recommend to build a big, safe RAID0 array with?

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