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Re: [PLUG] arg! Linux renumbered devices again!
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On Tuesday 18 June 2002 23H:21, gabriel rosenkoetter wrote:
> On Tue, Jun 18, 2002 at 11:12:28PM -0400, Noah Silva wrote:
> > I decided to reboot the machine since it is, after all, my PC and not a
> > server. This time, I looked in the BIOS and saw the CD is the
> > "Secondary master"
>
> Means it's plugged into the endpoint of the IDE cable connected to
> your secondary IDE bus. (The middle plug is the slave.)
>
A bit of archaic PC-clone info:
The middle connector is defined as the slave only with the newer UDMA IDE
cables (80 conductors and generally color coded - pardon while I attempt to
restrain my excitement). With the older IDE cables (for use with IDE and
EIDE, but not UDMA over 33 MB/s.), you generally had to rely solely on the
jumpers on the drives for Master/Slave. You can even still plug a plain
40-conductor IDE cable into a UDMA IDE controller and connect UDMA devices,
but you typically won't get UDMA performance better than 33 MB/s. And with
two drives on an older cable, feel free to plug the master into the middle
connector.
I believe that the newer cables support Cable Select, which allows you to not
set the jumpers as Master or Slave on the drives, but you should also be able
to set the jumpers as long as you connect the drives into the right
connector. If you don't set the jumpers for Master or Slave, you should
probably make sure they are jumpered for Cable Select.
One of the big reasons why this was changed is due to signalling problems when
you connect only one drive and connect it to the middle of the cable. This is
due to the fact that there is no termination on the IDE bus.
Probably more than anyone wanted to know,
- -Jason Nocks
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