OSX Limit to number of USB Hard drives?

Discussion in 'macOS Sierra (10.12)' started by CIA, Feb 13, 2017.

  1. CIA macrumors 6502a

    Jun 17, 2003
    We use a 2012 Mac Mini as a simple file server here at work, running latest version of OS X, (not server).

    We currently have 10 drives hooked up the machine. All Seagate. 8 of them are through a Anker USB3 hub, 2 are straight into the back of the mini. It doesn't matter how I have them hooked up, today I finally realized that some of the crashes that have been happening have been because the moment I plug in another drive (be it through the hub, or into the back of the machine) the Mini will hard crash.

    10 drives work fine, 11 crashes the machine without fail. It does not matter what drive I try to plug in (we have many other externals laying around) if I plug in a 11th drive the mini will hard crash.

    Any ideas? The mini is a clean install, no additional apps beyond our cloud backup software.
  2. ljonesj macrumors 6502a


    Oct 20, 2009
    Kingsport TN
    Might be to much power draw do the hard drives have there own power
  3. CIA thread starter macrumors 6502a

    Jun 17, 2003
    They are all large (3TB-5TB 3.5") drives in powered external enclosures.

    All of them are from this family of Seagate drives.

    /edit The USB hub is also powered.
  4. casperes1996 macrumors 68040


    Jan 26, 2014
    Horsens, Denmark
    There should be no limit in OS X/macOS itself, but there might be some limitation with the chipset in the Mac mini. Don't know about that

Share This Page

3 February 13, 2017