When I read the review of the Plextor 716 here at cdfreaks I noticed that the drive support Ultra DMA mode 4 (perhaps other drives do this too?), but is this increase in bus speed compared to UDMA 33 needed? The maximum tranfer rate of a 16x dvd-burner is no more than 22MB or so, right? So in what situations will you benefit from mode 4?
(The reason I’m asking is because I’ve got an old computer with an UDMA 33 controller and I’ve been thinking of getting a controller card to get more out of my three 120GB Seagate Barracud 7200.7 and that way get a free channel for a burner on the on-board controller. I was thinking of choosing a Promise Ultra ATA/133 TX2 because it’s cheap and easy to find where I live. I did read the thread here where alot of people said Promise wasn’t recommended for optical drives so I figure I’d use it only for hard drives.)