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Re:Originally posted by: guy
hmmm…
check the bios/driver version of the ultra66 (http://support.promise.com/Support/All.asp?product=ultra66)
Not too long ago, I upgraded the Ultra66 bios to the newest one on their website so unless they came out with a new BIOS in the past month, mines should be current.
the ultra66 should be able to do ata66 on each channel, no?
That's what I was thinking but the bottleneck seem to be one of the two drives on the card. Could my motherboard's PCI be the limitation for the Promise card?
you said you were going to switch the ide cables….did you try that or did you just switch the drive?
I switched the cables and the drives with one of the ones that were working properly, the buffer was still inbalanced.
the 33 mhz pci bus can do a theoretical transfer of 132MB/s burst….
12 speed cdroms need a data transfer rate of 1.8MB/s so you need 7.2MB/s for four 12 speed burners…(I think 
)
have you tried maybe 6x for each burner and see if it works? what's the highest speed that all burners can do properly?
I will try that drives at a lower speed. Well, the first attempt, all drives burned the disc correctly, there was just 220 or so "buffer underun errors" that were prevented by burn-proof. The drives have a max burn speed of 12X. I will try 10X to see if I still get the track error and the buffer inbalance.
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maybe consider doing this:
change iomega to plextor (http://www.cdmediaworld.com/hardware/cdrom/cd_modifications_iomega_121032.shtml)
then:
latest plextor firmware (read the version history of the previous upgrades too) (http://www.plextor.com/english/support/downloads/firm_1210.html)
OHHH I didn't know flashing the iomega drives to plextor was a two step process. I will definitely flash the "plextor" drives to the newest revision. Thanks so much for your help! I'll post back on what I find!! 
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Re:hmmm…
check the bios/driver version of the ultra66 (http://support.promise.com/Support/All.asp?product=ultra66)
the ultra66 should be able to do ata66 on each channel, no?
you said you were going to switch the ide cables….did you try that or did you just switch the drive?
the 33 mhz pci bus can do a theoretical transfer of 132MB/s burst….
12 speed cdroms need a data transfer rate of 1.8MB/s so you need 7.2MB/s for four 12 speed burners…(I think )
have you tried maybe 6x for each burner and see if it works? what's the highest speed that all burners can do properly?
—————————————————-
maybe consider doing this:
change iomega to plextor (http://www.cdmediaworld.com/hardware/cdrom/cd_modifications_iomega_121032.shtml)
then:
latest plextor firmware (read the version history of the previous upgrades too) (http://www.plextor.com/english/support/downloads/firm_1210.html)
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Re:I have a theory on what might be one. I've swap the drives so it's not a cdrw drive issue. I think what is wrong is that the two cdrw drives on the Promise Ultra66 controller card is being limited by the capabilities of the PCI slot. Isn't the PCI slot only able to transfer 33MB/sec? Thus in order to solve the issue of the "lagging" drive, I need to get two Promise Ultra66 cards and put one cdrw on each of them to remove the bottleneck. Someone please correct me if I'm wrong. I'm beginning to think if this belongs in the highly technical issue forum since this isn't your common computer configuration.
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Re:Okay DMA is already enabled for all of the drives. I have noticed that it's one of the drives (the one that laggs) that is causing the excessive buffer underruns. For example, if I select to burn 3 drivess WITH the lagging drive as one of them, I would get over 100 buffer underrun errors (prevented by burn-proof). However, if I select the 3 drives that does include the lagging one then I get at most 1 buffer underrun error. Could there be something wrong with the drive? I'm going to try to swap cables and see if it's a hardware setting error. Any one know how to enable DMA on a Promise Ultra66 controller card? Or is it automatically enabled by default?
Another thing I've noticed about this lagging drive is that when the drive is part of the 3 drives that is burning, the buffer fluctuates between all the drives. However, when I burn with the three drives that does not include the lagging drive, the buffer are more or less stable at 76%. What could it be? Drive? Setting?
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Re:YES, set the DMA to on! That will make a HUGE difference, especially if you're using multiple burners.
If you aren't using DMA, most likely each transfer to each drive is taking some CPU cycles. Even with one drive, you're CPU will end up losing that battle.
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Re:I love the title of this kb article:
Device Settings Are Hard to Find in Windows (http://support.microsoft.com/search/preview.aspx?scid=kb;en-us;Q247426)
(for DMA setting in w2k)
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