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    SubjectRe: Of removable devices
    Vojtech Pavlik wrote:
    >
    > On Mon, Feb 21, 2000 at 09:23:59AM +0100, David Balazic wrote:
    > >
    > >
    > > Vojtech Pavlik wrote:

    [ snip ]

    > > > Yes, but AmigaOS didn't do it on PC hardware. They did use the same
    > > > floppies PC does, but a different controller. PC floppy controller
    > > > updates the disk change flag only after stepping the head. If you don't
    > > > want to step the head constantly (and also spin the motor all the time),
    > > > you can't check for floppy insertion/removal easily.
    > >
    > > You just described how amiga-floppies work !
    > > Ten bonus points for you :-)
    >
    > Well, yes, but on Amiga you can step from track 0 to track 0. Not
    > possible on a PC controller.

    Hmm, amiga does a normal step , this is the source of that famous
    clicking.
    Newer floppy units allow a trick , which must be manually activated in
    the OS.
    That is that you try a step from track 0 to track -1 , but the head is
    not
    moved , only the disk-change is updated.

    david

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