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DMA & two optical drives
Hi all:
I'm wondering: if I have two optical drives connected together, can I get them both use DMA? Right now I have one CD-RW connected to a DVD-ROM: CD-RW as master and DVD-ROM as slave. Under "Properties" in "Device Manager" it says current mode of transfer for device 0 is "Ultra DMA" and for device 1 it is "PIO", although in the transfer mode boxes both have "DMA if available". It looks like to me only one drive -- I am guess it is the CD-RW -- is using DMA and the other one is not, and the reason being DMA is only available for one of the drives. Am I correct? If not, is there a way for both of them to use DMA? If only one of them can use DMA, then which one would benefit more from it: CD-RW or DVD-ROM? My OS is XP Pro and I'm using P4 2.53. Thank you! Alex |
#2
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There maybe a bios setting for enabling UDMA on the IDE channels, The slave
of the 2ndary may have it disabled OR like you said but most of todays Opticls will use some level of DMA "678" wrote in message ... Hi all: I'm wondering: if I have two optical drives connected together, can I get them both use DMA? Right now I have one CD-RW connected to a DVD-ROM: CD-RW as master and DVD-ROM as slave. Under "Properties" in "Device Manager" it says current mode of transfer for device 0 is "Ultra DMA" and for device 1 it is "PIO", although in the transfer mode boxes both have "DMA if available". It looks like to me only one drive -- I am guess it is the CD-RW -- is using DMA and the other one is not, and the reason being DMA is only available for one of the drives. Am I correct? If not, is there a way for both of them to use DMA? If only one of them can use DMA, then which one would benefit more from it: CD-RW or DVD-ROM? My OS is XP Pro and I'm using P4 2.53. Thank you! Alex |
#3
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JAD wrote:
There maybe a bios setting for enabling UDMA on the IDE channels, The slave of the 2ndary may have it disabled OR like you said but most of todays Opticls will use some level of DMA Thank you for your reply! I did a little bit of research after I'd posted and came up with one method: re-install IDE2. I went to Device Manager and keep transfer mode for both devices as "DMA if available" even though current transfer mode says "PIO". Then right click and choose "uninstall". After uninstallation of IDE2 is done, right click on "IDE ATA controller" and choose "scan for hardware changes" to re-install IDE2. Viola! Now both have current mode of transfer in "Ultra DMA"!! Alex "678" wrote in message ... Hi all: I'm wondering: if I have two optical drives connected together, can I get them both use DMA? Right now I have one CD-RW connected to a DVD-ROM: CD-RW as master and DVD-ROM as slave. Under "Properties" in "Device Manager" it says current mode of transfer for device 0 is "Ultra DMA" and for device 1 it is "PIO", although in the transfer mode boxes both have "DMA if available". It looks like to me only one drive -- I am guess it is the CD-RW -- is using DMA and the other one is not, and the reason being DMA is only available for one of the drives. Am I correct? If not, is there a way for both of them to use DMA? If only one of them can use DMA, then which one would benefit more from it: CD-RW or DVD-ROM? My OS is XP Pro and I'm using P4 2.53. Thank you! Alex |
#4
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I know it wasn't your problem, but I have a drive which wouldn't do dma
until I updated the firmware. -- Ed Light Smiley :-/ MS Smiley :-\ |
#5
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In article , 678 says...
JAD wrote: There maybe a bios setting for enabling UDMA on the IDE channels, The slave of the 2ndary may have it disabled OR like you said but most of todays Opticls will use some level of DMA Thank you for your reply! I did a little bit of research after I'd posted and came up with one method: re-install IDE2. I went to Device Manager and keep transfer mode for both devices as "DMA if available" even though current transfer mode says "PIO". Then right click and choose "uninstall". After uninstallation of IDE2 is done, right click on "IDE ATA controller" and choose "scan for hardware changes" to re-install IDE2. Viola! Now both have current mode of transfer in "Ultra DMA"!! Alex "678" wrote in message ... Hi all: I'm wondering: if I have two optical drives connected together, can I get them both use DMA? Right now I have one CD-RW connected to a DVD-ROM: CD-RW as master and DVD-ROM as slave. Under "Properties" in "Device Manager" it says current mode of transfer for device 0 is "Ultra DMA" and for device 1 it is "PIO", although in the transfer mode boxes both have "DMA if available". It looks like to me only one drive -- I am guess it is the CD-RW -- is using DMA and the other one is not, and the reason being DMA is only available for one of the drives. Am I correct? If not, is there a way for both of them to use DMA? If only one of them can use DMA, then which one would benefit more from it: CD-RW or DVD-ROM? My OS is XP Pro and I'm using P4 2.53. Thank you! Alex Good for you. Now that you have treated the symptom of that disease maybe you should examine the cause. Most of todays optical drives will use DMA as default. If a drive records so many errors within a certain time frame Windoze XP will reduce the speed to PIO to protect the drive. Most likely your drive was recording some type of errors when you were using it and this is why it was reading PIO. The next time that you use that drive I suggest checking the event viewer in systems managemant console to see if you are getting errors. It may have been a fluke and never happen again but if it continues to revert to the PIO mode then you have other problems. This information is brought to you from an owner of a TDK velocdrw that now functions correctly ( third TDKVelo drive I tried after RMA'ing 2 others). Ed |
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