Strange things with my hard drive

[Kerry Hoath]

The hardware has a drive select pin. setting it to one value accesses master
and setting it to the other accesses slave. Only one state can ever be
set on the cable so it stands to reason that you can not access _both_ devices at once
the system must share the bus between both devices.
Often this can be done if both devices play nice or if one device is rarely used
but it does limit performance if both devices want significent time
on the bus or are beeing polled for some status bit to change.

Regards, Kerry.
On Mon, Feb 25, 2002 at 02:33:52AM -0500, Pete wrote:
> 
>   I thought this only applied if you were using 16 bit drivers?  Maybe it
> was a miss print in a microscoff artical.
>   Pete
> >
> > On Mon, Feb 25, 2002 at 11:04:33AM +0800, Kerry Hoath wrote:
> > > This is not a good idea unless ide channels are limited.
> > > The reason for this is that once one device is accessing the ide bus the
> other
> > > device doesn't get a look in until the first device has finished.
> > > The practical upshot of this is that installs from cdromt o hard disk go
> really slowly because
> > > both devices want contention on the ide bus.
> > > With the multitude of IDE devices these days it can be difficult to get
> the combinations right.
> > > Slaving a cdrom to a burner is ok provided you don't want to do
> on-the-fly
> > > copying with your cdrom to burner.
> > > Slaving a burner to a hard drive can also cause problems if your i/o
> subsystem is not up to
> > > keeping both devices busy.
> > > If you have a cdrom only put it master on the secondary controller if
> you don't have 2 hard drives or put it as
> > > slave on the secondary if you have a hard drive on both controllers.
> > > If you have a cdorm and a burner I cable like this:
> > > primary master, hard drive.
> > > Primary slave, empty
> > > Secondary master, cd burner, secondary slave, cdrom.
> > > I don't on-the-fly copy from cd to burner, I let the computer
> > > put it on the hard drive as an intermediate step.
> > >
> > > Regards, Kerry.
> > > On Sun, Feb 24, 2002 at 08:02:31PM -0500, Alex Snow wrote:
> > > > I've never bilt a computer, but i've taken about 100 apart.  In most
> cases,
> > > > and most of the machines I gutted were older ones, the cdrom is slaved
> to
> > > > the hard drive witch is the master.
> > > >
> > > >
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> > >
> > > --
> > > Kerry Hoath:  kerry at gotss.net kerry at gotss.eu.org or
> kerry at gotss.spice.net.au
> > >
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> >
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> 
> --
> Kerry Hoath:  kerry at gotss.net kerry at gotss.eu.org or
> kerry at gotss.spice.net.au
> 
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-- 
Kerry Hoath:  kerry at gotss.net kerry at gotss.eu.org or  kerry at gotss.spice.net.au