IDE Master/Slave Config

[Benedikt]

Hi,

my first IDE channel config:

1.) Master -> UDMA 100 HDD 20GB
2.) Slave -> UDMA 66 HDD 8.5 GB

Does this affect the performance of the master drive? Or is it possible to run 2 IDE HDDs with different UDMA modes at the same time at the same cable? Or is my first drive only running with UDMA 66 now?

Thanks for your help.

 

[r0tt3n1]

AFAIK, you are correct in that both drives will use UDMA66.

 

[salsal]

you are correct in that both drives will use UDMA66.

So, my conf.

1st IDE: master - ATA 66 HD, slave - ATA 100 HD
2nd IDE: master - ATA 33 CD-RW, slave - ATA 33 HD

What is my speed?

 

[Benedikt]

But the VIA IDE-Tool and Sisoft Sandra reports that the first IDE drive IS RUNNING at UDMA 100 and the second at UDMA 66. So what is true now? And I heard too that IDE is able to run 2 drives at different speeds at the same cable at the same time(as long as they are 66 or 100 devices -> 80 pin cable).

 

[Shmorq]

<< my first IDE channel config:

1.) Master -> UDMA 100 HDD 20GB
2.) Slave -> UDMA 66 HDD 8.5 GB

Does this affect the performance of the master drive? Or is it possible to run 2 IDE HDDs with different UDMA modes at the same time at the same cable? Or is my first drive only running with UDMA 66 now? >>

From my understanding, your UDMA00 device will potentially run at 100MB/s and your UDMA66 will potentially run at 66MB/s.

As to the question about the UDMA33 and UDMA100, the same holds true since UDMA100 controllers are backwards compatible to the slower devices.