I’ve just put in a 1620 on an add-in Adaptec ASH-1233 IDE controller, which is based on the Sil 680 chipset. The Adaptec “auto-detects drive types and fine tunes to optimal performance” (from the box). IOW, the card decides how to set the DMA mode for a particular drive, and there are no settings the user can change.
The problem: the Adaptec thinks the 1620 should be set at “Multi-word DMA Mode 2”, not “Ultra DMA Mode x”, which results in a burst rate of only 13 MB/s. I had the 1620 originally set up as Master, and a Lite-on 1693S as Slave. The Lite-on was getting 24 MB/s burst rate. Adaptec tech support said the card was working properly (I gave them a fully detailed explanation of the issue), and to separate the drives onto their own channels. I did that, and changed the cable on the 1620 for good measure.
Now the Lite-on blasts a burst rate of 33 MB/s–faster than any of my other 4 drives–but the 1620, which is now sitting alone on the primary channel, still only manages 13 MB/s burst.
My mobo BIOS settings are correct.
Has anyone else seen this problem on their 1620? If not, I figure I either have a problem drive, or there’s something about the drive that the Adaptec card doesn’t like. I’ve emailed BenQ about it, but I don’t have much hope that they’ll tell me anything other than “It’s your controller card” (tho I hope to be proved wrong). The little bugger does rip DVDs pretty fast, tho–I saw it get up to 10x on the last one.
Anyway, if anyone has seen this behavior before, please let me know. Thanks.