How to enable UDMA 4 on 56X CDROM

[Kuasimodem]

UDMA mode 4 is also called UDMA66 or ATA66. The motherboard may support it, but does the CDROM drive support it? Many CDROMs only support UDMA mode 2, which is ATA33. You will have to check the specs on your drive to see if it does support UDMA66.

[nishant]

Hi,
I've got a CTX 56X CD-Rom Drive. My Mobo is an intel 850 motherboard. I used a program and found out that UDMA mode 4 is supported but it is not enabled. It says UDMA 2 is enabled at the moment. Is there any way I can Change it to UDMA mode 4? Actually how can I change the UDMA settings for hard disks too (for the sake of knowledge).
Any help would be really appreciated.
Thanx in advance

[This message has been edited by nishant (edited 07-26-2001).]

[FlipChip]

Why do you need to enable udma 4 on a CD rom drive? There is no CD rom drive that can transfer at that speed anyhow. (at least none that I know of) You're not even going to get 33 mbps from a cd rom so udma 2 is more than fast enough. As an example, my teac 40X CD rom has a max transfer rate of 6MBps. The 52X Creative CD rom transfers at 7.8MBps. Maybe some day we'll have 400X CD rom drives? LOL Can you amagine the RPM that the CD would have to spin at to achieve a 66MBps transfer rate? You'd be able to read a 650 MB disk in 10 seconds!
Hope this helps.

-WS

[DanU]

I don't think we'll be seeing much of an increase in speed with CD-ROMS. If they rotate any faster then the CDs will shatter. In fact, people are already reporting shattered CDs with today's high-speed CD-ROM drives. The only way to get around it is with some sort of multi-beam technology like the kenwood drives.

[Apostle 83]

Exactly. In fact, the 72x Kenwoods, if I remember correctly, rotate at around 40x levels, right?

I think in the near future we'll begin to see a new type of CDrom label... such as 32xtrue and 32x.

Let's face it, the slower the drive spins the more consistant the reading will be, and the less damage to the disk. This is why I don't like going above 48x ever, and on my comp I have a 32x

[tuux]

My Hitachi 16X DVD-ROM has a burst transfer rate of 66.7MB/s (UDMA66) and complains if I put it on a UDMA33 Cable.
So could be poss. that some CD-ROMs may use it too now.

[LostBok]

Tuux jsut mentioned what COULD be the answer Nishant is looking for:

"UDMA33 cable" - make sure you are using a UDMA66/100 cable, otherwise you've got no chance of getting that to work.

laters!