[Peter M]

Quote:

Originally Posted by skuz

Both my DVD drive and CDRW are UDMA33, so I put them on the same channel.

It amazes me that the most sold CD-ROM drive around here (LG) is still not UDMA compatible, only PIO4.

The LG drives can do DMA, MWDMA mode 2 to be exact. That's a 16 MB/s mode, plenty for any speed of CD-ROM. 1x speed being 150 KB/s, MWDMA mode 2 is enough for up to 100x CD-ROM drives.

Remember, again, there is no interface bandwidth sharing on IDE - so while your CD-ROM drive is being accessed, the other drive on the same cable is completely blocked out of doing something - no matter whether the CD-ROM drive is PIO mode 4 or UDMA mode 6.

Taking all this into account, putting a higher interface mode than MWDMA2 onto a CDROM drive is a pure marketing feature. Technically, it's pointless.