My DVD rewriter has slowed to a crawl.
in [Hardware]
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From: kandinsky63 on 5 May 2010 18:49 Hi I have two Optiarc DVD RW AD-7170A drives in my PC -one is master and other is slave. Today I decided to copy a DVD using the slave drive. However,I noticed that the speed of the slave drive was being limited to ~2mb/s. When I tried with the master drive, it was able to read at more than 10mb/s. Previous to this, both drives were reading and writing at approximately the same speeds. To try and cure the problem I uninstalled both drivers and reinstalled on boot-up, even switched the cables to the drives. Unfortunately this did not make the slave drive operate at the same speed as the master. This approach had worked before but not on this occasion. I then decided to swap them over, the master drive becoming the slave and vice versa. When I tried to read the DVD, the drive that was previously the slave but now the master drive was able to read at speeds over 10mb/s. I have tried everything that I could think off to reset the slave drive to read/write at the same speed as the master. Anybody got any ideas as to what is going on and how I can resolve the issue? thanks
From: Paul on 5 May 2010 19:34 kandinsky63 wrote: > Hi > > I have two Optiarc DVD RW AD-7170A drives in my PC -one is master and other > is slave. > > Today I decided to copy a DVD using the slave drive. However,I noticed that > the speed of the slave drive was being limited to ~2mb/s. When I tried with > the master drive, it was able to read at more than 10mb/s. Previous to this, > both drives were reading and writing at approximately the same speeds. > > To try and cure the problem I uninstalled both drivers and reinstalled on > boot-up, even switched the cables to the drives. Unfortunately this did not > make the slave drive operate at the same speed as the master. This approach > had worked before but not on this occasion. > > I then decided to swap them over, the master drive becoming the slave and > vice versa. When I tried to read the DVD, the drive that was previously the > slave but now the master drive was able to read at speeds over 10mb/s. > > I have tried everything that I could think off to reset the slave drive to > read/write at the same speed as the master. > > Anybody got any ideas as to what is going on and how I can resolve the > issue? > > thanks Compare an ordinary data DVD to a video DVD, and see if the speed is different. You could, for example, test with Nero CD/DVD Speed tool, and see if a video DVD behaves different than a data DVD. http://en.wikipedia.org/wiki/Riplock If you don't have a tool to test with, maybe this would work. I have an older version that came with an OEM version of Nero (came with the burner). ftp://ftp6.nero.com/tools/DiscSpeed.zip That tool, should look roughly like this. The red line, marks where the original burn stopped. If you didn't fill the disc, the whole thing cannot be benchmarked. The tool will read the data, up to where the red line is. It will read it, as fast as possible. http://img21.imageshack.us/img21/5894/discspeed.png ******* Now, there is another possibility. The drive could have slipped into PIO mode, where the processor transfers each word of data individually, without benefit of hardware DMA to automate the transfer. That might change the shape of your Nero test result, as the transfer rate curve could be "bus limited". Paul
From: kandinsky63 on 9 May 2010 10:13 Unless I have misunderstaood your reply, surely , your solution/advice should apply to BOTH DVD drives. If you read my original query , when i change the configuration of the drive from slave to master, it begins to operate correctly. When I change it back to 'slave' , the read/write speed is limited to ~2mb/s and not the expected >10mb/s. The same applies to the other dvd drive. "Paul" <nospam(a)needed.com> wrote in message news:hrsva2$ukm$1(a)speranza.aioe.org... > kandinsky63 wrote: >> Hi >> >> I have two Optiarc DVD RW AD-7170A drives in my PC -one is master and >> other is slave. >> >> Today I decided to copy a DVD using the slave drive. However,I noticed >> that the speed of the slave drive was being limited to ~2mb/s. When I >> tried with the master drive, it was able to read at more than 10mb/s. >> Previous to this, both drives were reading and writing at approximately >> the same speeds. >> >> To try and cure the problem I uninstalled both drivers and reinstalled on >> boot-up, even switched the cables to the drives. Unfortunately this did >> not make the slave drive operate at the same speed as the master. This >> approach had worked before but not on this occasion. >> >> I then decided to swap them over, the master drive becoming the slave and >> vice versa. When I tried to read the DVD, the drive that was previously >> the slave but now the master drive was able to read at speeds over >> 10mb/s. >> >> I have tried everything that I could think off to reset the slave drive >> to read/write at the same speed as the master. >> >> Anybody got any ideas as to what is going on and how I can resolve the >> issue? >> >> thanks > > Compare an ordinary data DVD to a video DVD, and see if the speed is > different. > You could, for example, test with Nero CD/DVD Speed tool, and see if a > video > DVD behaves different than a data DVD. > > http://en.wikipedia.org/wiki/Riplock > > If you don't have a tool to test with, maybe this would work. I have > an older version that came with an OEM version of Nero (came with the > burner). > > ftp://ftp6.nero.com/tools/DiscSpeed.zip > > That tool, should look roughly like this. The red line, marks where the > original burn stopped. If you didn't fill the disc, the whole thing > cannot be benchmarked. The tool will read the data, up to where the > red line is. It will read it, as fast as possible. > > http://img21.imageshack.us/img21/5894/discspeed.png > > ******* > > Now, there is another possibility. The drive could have slipped into PIO > mode, > where the processor transfers each word of data individually, without > benefit > of hardware DMA to automate the transfer. That might change the shape of > your > Nero test result, as the transfer rate curve could be "bus limited". > > Paul
From: Paul on 9 May 2010 11:29 kandinsky63 wrote: > Unless I have misunderstaood your reply, surely , your solution/advice > should apply to BOTH DVD drives. If you read my original query , when i > change the configuration of the drive from slave to master, it begins to > operate correctly. When I change it back to 'slave' , the read/write speed > is limited to ~2mb/s and not the expected >10mb/s. The same applies to the > other dvd drive. > > OK, so I did mis-understand your question. On modern computers, there should be no interaction between devices with respect to speed. If you switch the drives around, master or slave, it should not affect their rate. So I cannot explain the different that way, as a bus issue. Have you checked to see what the claimed operating mode is for each drive ? Are they both DMA or are they PIO ? Are you using an 80 wire cable ? Sometimes, that is enough to give better quality signal transmission. On some older systems, there do seem to be issues with a difference in behavior between master and slave, but I've never seen any technical explanation for why that would be. On a modern system, if one device wanted to run UDMA5 and the other one UDMA4, that is supposed to be OK. They both don't need to run at the same speed. And one drive should not "drag down" the other. Paul
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