disk identifier - disk1s2 - what does the "s" stand for?

Discussion in 'macOS' started by LeeTom, Jul 17, 2010.

  1. LeeTom macrumors 68000

    LeeTom

    Joined:
    May 31, 2004
    #1
    Hello - I just got an insatiable curiosity to understand Mac OS X's disk identifying convention. I know the first disk in a system is "disk1", and the first usable partition is disk1s2. I'm assuming that disk1s1 holds partition information (the partition map maybe?) and that's why the first usable disk is "s2", but my question is pretty simple:

    WHAT DOES THE "s" STAND FOR?!

    Thank!
    Lee Tom
     
  2. tkermit macrumors 68040

    tkermit

    Joined:
    Feb 20, 2004
  3. Ganesha macrumors regular

    Joined:
    Aug 4, 2009
    #4
    It used to mean only slice, but now it can also mean session. So you can end up with a valid disk identifier if the form of diskAsBsC (where A is device number, B is the session number, and C is the slice)
     

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