1 Reply Latest reply: Sep 16, 2012 1:28 PM by BDAqua
David Yellen Level 1 (110 points)

My iMac is acting very strangely: after a restart, an external drive (or more) may suddenly become "locked" for no apparent reason. Just restarted and got an error message that it could not complete a Time Machine backup because it is on a "locked Volume".


Running "repair" in Disc Utility fixes the issue, although it never reports any actual problem on the volume.


I have also started having kernel panics, which I think may be related.


Any idea what might be causing this?

iMac (24-inch Early 2009), OS X Mountain Lion (10.8.1)
  • BDAqua Level 10 (122,202 points)

    Hello, see how many of these you can answer...


    See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...





    Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?


    How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.


    Open Console in Utilities & see if there are any clues or repeating messages when this happens.


    In the Memory tab, are there a lot of Pageouts?