Dave,
> On Tue, Feb 13, 2001 at 11:35:00PM -0000, John Kennedy wrote:
> > Should I remove the CDROM after installing RH-7.0
> > or is it advisable/possible to buy a separate
> > IDE controller card to connect 'just to' the IDE CDROM?
>
> The latter is certainly correct if you're worried about performance.
>
> I know that an operating CDROM as a slave _will_ slow transfers. I'm not
> certain if just its presence, operating or not, will slow the bus--my
> gut response is not. (But I'm certain that if I'm wrong, the collective
> intellect here will correct me _muy pronto_.)
I heard that many IDE controllers cannot set different PIO and DMA modes for the
master and the slave, so you get the lowest level both devices (the HD and the CD-ROM)
can support. Besides, IDE controllers serialize requests so you cannot read from the
HD while you wait from data to came from the CD-ROM. That's different from SCSI which
can send commands to one device while waiting other device retuns data.
[]s, Fernando Lozano
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