DMA speed

[marneus]

With all these superfast CDRW speeds (now up to 52x52x24x) coming out, I have but one question... are these still running DMA33 or have they made it any higher ??

(I have DMA100 HDD & DMA100 DVD drive, notion of a newer CDRW as mine is only DMA33 if its available)

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[lagger]

as far as I know we are still stuck with dma 33

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[lhgpoobaa]

For CD-RW, ata33 is all you currently need.
Why?
Consider the 52x24x52x burner.
1x is 150Kb/sec
Max speed is 52x, which equates to 7,800Kb/sec.
Max transfer rate of ata33 is 33,000Kb/sec.
Thus at its fastest a 52x drive is only taking up ~24% of the bandwidth.

Even with 16x DVD drives the max transfer rate is only 21-22mb/sec, still comfortably below the ata33 limit. The odd one out is pioneer. They have opted for a ata66 dvd drive, possibly for added future headroom or better compatibility with IDE ahrd drives. *shrugs* Who knows.

Anyway, modern system can cope well enough with drives of differing speeds, like a ata33 burner and a ata100 IDE drive on the same cable.
Allthough i still prefer to keep IDE drives and optical drives on seperate channels. Keeps things simple.

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[HammerBot]

Yes, the math is valid. But I still think it sucks. Since the drives only uses UDMA33 they waste a significant amount of the available bandwidth of an UDMA100 controller.
Another reason for not putting a HD and a CD on the same cable. Well, at least not if you want to use that HD and CD simultaneously.

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[Spitfire_x86]

Is it right to use a ATA-33 CD-RW as master and a ATA-33 HDD as slave in a ATA-100 controller to get max. performace when using both simultaneously?

What Audio Compression Technology you use for storing music? <A HREF="http://forumz.tomshardware.com/community/modules.php?name=Forums&file=viewtopic&p=25137#25137" target="_new"> Tell Here</A>

 

[HammerBot]

It would be better to put them both as master on separate controllers.

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[Spitfire_x86]

I have a ATA-100 hard drive as primary master, no primary slave. ATA-33 CD-RW as secondary master and ATA-33 HDD as secondary slave. I have no more IDE connectors. Isn't it configured for max. performace?

What Audio Compression Technology you use for storing music? <A HREF="http://forumz.tomshardware.com/community/modules.php?name=Forums&file=viewtopic&p=25137#25137" target="_new"> Tell Here</A>

 

[HammerBot]

Yes, that would be the most optimum configuration.

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[marneus]

hmmm Asus drive @ DMA100, its a bit of a marketing thing then... how disappointing,...

no-one shouts louder than someone who is being ignored, or in the case of techies, to be heard over the noise of their PC's ;-)

 

[HammerBot]

So is a harddrive using UDMA133.

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[ChrisPW]

If your running any OS with an NT core (NT, 2K, XP) the drive will operate in PIO mode anyway.

The is a Microsoft "feature" they don't tell ppl about. Apparently some of the first ATAPI drives caused problems running in PIO mode so Microsoft forced them to run in PIO mode and they have never changed it.

 

[Spitfire_x86]

If your running any OS with an NT core (NT, 2K, XP) the drive will operate in PIO mode anyway.

Noooooo...........

You can choose DMA or PIO mode in a NT Core OS (Win2000/XP, don't know about NT 4.0) from Device Manager---IDE ATA/ATAPI controllers---Primary IDE channel / Secondary IDE channel---Advanced Settings---Transfer Mode---DMA if available.

However, you can't force DMA in Win2000/XP.

Let us know <A HREF="http://forumz.tomshardware.com/community/modules.php?name=Forums&file=viewtopic&p=25703#25703" target="_new"> What File compression format you use? </A>

 

[lhgpoobaa]

Correct.

You should be able to select PIO or DMA or UDMA mode for your optical drive, provided you have up to date chipset and device drivers.

However occasionally stability or compatibility issues make it default to PIO.

That happened with my ATA66 pioneer106S. Most the time it behaved itself and stayed on UDMA, but from time to time it would mysteriously default back to PIO. The last time it did that i had to reinstall the secondardy IDE controller for DMA to "stick".

Soon after i found the drive had partially died and no longer read DVD disks... so maybe it had cauze to default back to PIO.

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