Originally posted by Saraev
Correct me if I'm wrong, but doesn't throwing a CDrom/DVD/burner on the same cable as a hard drive cause the whole cable to run at DMA33 instead of 66/100/133 ? For that reason alone I keep my cd drives on the secondary chain.
nope. but it can definately slow a hard drive down.
if you have a hard drive on the same cable as a cdrom
drive, and put a cdrom in the drive that the drive can't
read, your system will slow to a crawl, because the
cdrom will keep getting that bus locked to try to read
things it can't and will hang up everything. whatever is
sharing a cable, cannot both be transferring data on the
cable at the same time. they take turns.
the master should be at the end of the cable, with the
slave in the middle, but it will usually work both ways
with the old style 40 pin cable.
lots of drives will not work well together at top speed.
i've often had to slow down a drive a dma mode or 2
when it has another drive on the cable with it, to get it
to work right. luckily with most drives it makes little
difference between the top 2 speeds the drive will run
at. some basically run the same speed at udma 66 or
it's also possible to run both drives in cable select mode.
it's called cable select, because the cable is what
decides which drive is the master or slave. you can
buy or alter your own cable for this purpose. in this
situation both drives are set to cable select, and the
special cable with one of the wires to the master cut,
and, the drives get set master or slave by where they
are on the cable. this can be handy for moving drives
around without having to change jumpers. i can't
remember which pin to cut though, but i'm sure you
could find it on the web.
also, lots of cdrom drives will mess each other up
being on the cable with each other. i'll sometimes
go thru a stack of different brands and speeds of
cdrom drives and burners trying to find 2 that will
work together perfectly on a machine, with both in
dma mode. hopefully the new serial drives will
get rid of this madness. ( while probably introducing
a new madness of their own).
i just found some newer information on CS, that
corrects a few errors on my part. it's good info.