3 Replies Latest reply: Jan 17, 2014 9:04 AM by a brody
BPS Level 1 Level 1

I migrated from older G4 to a used IMac which had Leopard.  Now Installer refuses Snow Leopard, with error code "Disc used by Time Machine."  Possible previous owner used main drive for Time Machine backup site? 

iMac, Mac OS X (10.5.8)
  • Axeman1020 Level 6 Level 6

    Have you tried turning off Time Machine and removing the disc from the Time Machine preferences?

  • BPS Level 1 Level 1

    I gather from other postings on Apple.com that I probably should have completely wiped the hard drive of my used IMac before installing my own files.  I may still have to do that.  I tried shutting down Time Machine, which I am using with an external drive.  The previous owner apparently did not have an external drive.

  • a brody Level 9 Level 9
    Classic Mac OS

    Erasing is rarely necessary.


    But make sure your backup is not the only one that you have before installing anything is necessary.


    Note, if you have a G5 or G4 Mac you can't upgrade to Snow Leopard.


    If your intent is to upgrade to 10.7 or later, see this tip: