Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!keith From: keith@Apple.COM (Keith Rollin) Newsgroups: comp.sys.mac.programmer Subject: Re: How does the system know one disk from another? Keywords: Baffling, hidden info storage... Message-ID: <44974@apple.Apple.COM> Date: 20 Sep 90 04:26:48 GMT References: <403@caslon.cs.arizona.edu> Distribution: comp Organization: Apple Computer Inc., Cupertino, CA Lines: 22 In article <403@caslon.cs.arizona.edu> mldemsey@cs.arizona.edu (Matthew L. Demsey) writes: > > How exactly can a program, the system, etc. tell the difference between >two floppies. If I take floppy (ok, firm) disk A and call it 'Blah', an d >insert it into my only internal firm drive, then hit shift-cmd-1 and proceed >to insert firm disk B, also named 'Blah' - the system will create >a new icon on the desktop and leave disk A's icon greyed... and when >I insert A back in, it highlights A's original icon... So the question is: > What information is it reading to discern the difference, > Where is this stored, > and Which textual references can I find on this? The technique I always recommend is to remember the volume's name and creation date. I seem to recall that the Alias Manager for System 7.0 saves that information along with the size of the volume. -- ------------------------------------------------------------------------------ Keith Rollin --- Apple Computer, Inc. --- Developer Technical Support INTERNET: keith@apple.com UUCP: {decwrl, hoptoad, nsc, sun, amdahl}!apple!keith "Argue for your Apple, and sure enough, it's yours" - Keith Rollin, Contusions