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    SubjectRe: Of removable devices
    On Mon, Feb 21, 2000 at 09:23:59AM +0100, David Balazic wrote:
    >
    >
    > Vojtech Pavlik wrote:
    > >
    > > On Fri, Feb 18, 2000 at 02:48:16PM +0100, David Balazic wrote:
    > >
    > > > > > At the same time - the fix is hardware, the PC isnt fixable for this the
    > > > > > CD-ROM drives are. The 2.2.x supermount stuff does that bit right
    > > > >
    > > > > Exactly. As far as there are no automatic gear for floppies you can not
    > > > > avoid manual unmount if you want reliable work.
    > > >
    > > > But you CAN ,as at least AmigaOS proves.
    > > >
    > > > If you didn't understand it at first, I'll repeat it :
    > > > IT CAN BE DONE !!!!!!
    > >
    > > 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.

    > Except they didn't have to turn the motor on.

    Another difference, yes.

    > And I'll repeat this question again :
    > Whose idea was to require a head-step for the update ?

    Don't know, it's in the floppy interface standard ...

    --
    Vojtech Pavlik
    SuSE Labs

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