DMA

[truffeltje]

Got a hard disk and a dvd on the prim ide and the cdr and cdrom on second ide.
Why does dma on the prim ide slow down my computer, i had various jumper settings,
dvd master and hard disk slave and that worked for ten minutes and the hole **** computer freezes.
When i shut down dma everything works fine.
What is the reason for this because dma on second ide works fine.

truffeltje

[BFlurie]

You might try a different IDE controller driver, but DMA can be flakey on some systems -- my CDRom has intermittent freeze-ups w/DMA, it runs reliably on PIO4. The HDs work fine w/DMA.

[wtp]

try making your DVD slave, and Harddrive master. Then for the other one, make your CD ROM a master, and the CD/R a slave. Then try it out. Also, if you are using U/DMA, you will get a big slow down, if you aren't using a ATA or UDMA/66/33 cable, or if one of the drives aren't compatible with it. It's good to have UDMA drives with other UDMA drives that are using a UDMA cable.

wtp



[This message has been edited by wtp (edited 07-07-2000).]

[Fingers]

An ATA-33 device on the same channel as a ATA-66 HDD will limit both drives to ATA-33. ATA-66 ain't that great anyway because it's only burst transfer rate, not sustained transfer.

As wtp said, make sure your drives are jumpered properly.
I'd also connect the CD-Rom as a slave to the HDD and put the CD-R and DVD on the second channel. The CD-Rom is less likely to cause DMA conflicts with the HDD. If your copying alot of CD's, you'll get better performance if the CD-Rom and CD-R aren't on the same channel.

Hope this helps

[truffeltje]

I am using the 40 pins flat cable and that supports udma 33 aint it?
I had configured all the jumper settings there are even used cable select.
The hard disk is a quantum fireball cr 13.0a
maybe that doesn't support udma.

truffeltje

[Fingers]

The 40 conductor cable supports up to ATA-33/UDMA-33. Try setting the jumper for the Quantum HDD to master an the DVD jumper to slave.

Better yet,
IDE HDD = primary master
CD-Rom = primary slave
DVD = secondary master
CD-R = secondary slave
Re-detect your HDD in the bios and make sure that DMA transfers are enable in the bios.