NF7-M - DVD drive won't run using DMA?
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From: RobV on 28 Jan 2008 22:40 Dave Garrett wrote: > In article <479e2724$0$1097$4c368faf(a)roadrunner.com>, [snip] >> If the cable is 80 conductor (you can tell easily, as the 80 >> conductor cable has really thin wires), maybe the DVD drive is at >> fault. Recheck that you have the jumpers set correctly. Try >> removing the cable from the CD drive so the DVD drive is the only >> thing on the cable, switch drives on the cable (changing jumpers as >> needed). Lots of things to try, but first confirm it's 80 conductor. > > Just popped the case and checked, and it's the older cable (40- > conductor). No wonder I was having problems. I've located a spare 80- > conductor cable I had lying around here still in the package it came > in, so I'm going to swap out the cables and hopefully DMA will work > properly then. Thanks. > > Dave You're welcome. :-) That was the reason a 80 conductor cable became necessary, as the 40 conductor "leaked" too much signal at higher transfer (DMA) rates and the signal would have a lot of noise, cross talk and all sorts of nasty problems by the time it got from one end to the other. The extra 40 conductors are all grounds that help clean up the signal along the length of the cable, allowing faster and more reliable data transfer at the higher DMA speeds. I'd be very surprised if the new cable didn't fix the problem.
From: Dave Garrett on 29 Jan 2008 00:00 In article <479ea03d$0$17328$4c368faf(a)roadrunner.com>, robv(a)nowhere.invalid says... > Dave Garrett wrote: > > In article <479e2724$0$1097$4c368faf(a)roadrunner.com>, > > > [snip] > > >> If the cable is 80 conductor (you can tell easily, as the 80 > >> conductor cable has really thin wires), maybe the DVD drive is at > >> fault. Recheck that you have the jumpers set correctly. Try > >> removing the cable from the CD drive so the DVD drive is the only > >> thing on the cable, switch drives on the cable (changing jumpers as > >> needed). Lots of things to try, but first confirm it's 80 conductor. > > > > Just popped the case and checked, and it's the older cable (40- > > conductor). No wonder I was having problems. I've located a spare 80- > > conductor cable I had lying around here still in the package it came > > in, so I'm going to swap out the cables and hopefully DMA will work > > properly then. Thanks. > > > > Dave > > You're welcome. :-) > That was the reason a 80 conductor cable became necessary, as the 40 > conductor "leaked" too much signal at higher transfer (DMA) rates and > the signal would have a lot of noise, cross talk and all sorts of nasty > problems by the time it got from one end to the other. The extra 40 > conductors are all grounds that help clean up the signal along the > length of the cable, allowing faster and more reliable data transfer at > the higher DMA speeds. I'd be very surprised if the new cable didn't > fix the problem. I've actually got two 40-conductor cables in this box - the primary IDE channel which the hard drive is running off of is also connected with one. It's also set to Ultra DMA, but I've never had any problems with the hard drive before comparable to those I was having with the DVD drive. I assume it'd probably be a good idea to swap out that cable with an 80-conductor one as well while I'm at it. Dave
From: RobV on 29 Jan 2008 00:53 Dave Garrett wrote: > In article <479ea03d$0$17328$4c368faf(a)roadrunner.com>, > robv(a)nowhere.invalid says... > >> Dave Garrett wrote: >>> In article <479e2724$0$1097$4c368faf(a)roadrunner.com>, >> >> >> [snip] >> >>>> If the cable is 80 conductor (you can tell easily, as the 80 >>>> conductor cable has really thin wires), maybe the DVD drive is at >>>> fault. Recheck that you have the jumpers set correctly. Try >>>> removing the cable from the CD drive so the DVD drive is the only >>>> thing on the cable, switch drives on the cable (changing jumpers as >>>> needed). Lots of things to try, but first confirm it's 80 >>>> conductor. >>> >>> Just popped the case and checked, and it's the older cable (40- >>> conductor). No wonder I was having problems. I've located a spare >>> 80- conductor cable I had lying around here still in the package it >>> came in, so I'm going to swap out the cables and hopefully DMA will >>> work properly then. Thanks. >>> >>> Dave >> >> You're welcome. :-) >> That was the reason a 80 conductor cable became necessary, as the 40 >> conductor "leaked" too much signal at higher transfer (DMA) rates and >> the signal would have a lot of noise, cross talk and all sorts of >> nasty problems by the time it got from one end to the other. The >> extra 40 conductors are all grounds that help clean up the signal >> along the length of the cable, allowing faster and more reliable >> data transfer at the higher DMA speeds. I'd be very surprised if >> the new cable didn't fix the problem. > > I've actually got two 40-conductor cables in this box - the primary > IDE channel which the hard drive is running off of is also connected > with one. It's also set to Ultra DMA, but I've never had any problems > with the hard drive before comparable to those I was having with the > DVD drive. I assume it'd probably be a good idea to swap out that > cable with an 80-conductor one as well while I'm at it. > > Dave Yes, it would be a very good idea. You probably haven't had problems with the hard drive because the cable is shorter than the one you're using for the DVD drive (that's usually the case), and/or the hard drive is the only device on that cable. Or, you're just lucky. The 80 conductor cables aren't expensive, or hard to get. Like you, I have at least a few of them lying around from other computers I've built over the years. And, of course, there's always the ubiquitous Radio Shack. ;-)
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