Using modern drives on UDMA33 ok?



Should I expect any problems trying to use a 7170 or 7200 (or anything else recent) on an old computer with UDMA33?


Loss of speed, maybe.


Of course I don’t expect the use it at max speed.

The 3520 and 3550, at 33M/sec, were fine writing at x6 (x8 worked sometimes, but mostly with constant underruns, so I avoided it). And these limitations are most likely due to the IDE controller, since x16 is just 66% of the theoretical max.


Just got it a 7200A. Seems okay at 33MB/sec, writing at x4. Will try faster later.


From the UDMA2 days i remember that i vould go @12x with my 3520.


[QUOTE=vroom;2061422]From the UDMA2 days i remember that i vould go @12x with my 3520.[/QUOTE]In theory x16 should also be within reach. But my usual writing speed with previous drives was x6. x8 would underrun sometimes (or most times) with the 3520, and pretty much always with the 3550.

Maybe different controllers do things different. The above was with an Intel BX chipset.


I had my 3520 in a BX chipset with a celeron 366 and 192mb of ram, but my hdd was in a different ide cable.


I’ve had the writer as slave. On both channels there were HDD masters. It happened regardless of which channel the data came from. That was on P3 550, 384MB.

Maybe the 7200A would like to go higher. :slight_smile: But I’m okay even if it just reaches x6 (which I expect it to).

What speed did you get from the HDD(s), BTW? Curiously, under Win98, I can read faster from DVDs than from the HDDs. XP’s better in this regard, but closer to 20MB/sec rather than 30.


In my experience using a 7170 and 7200 and a 40 conductor cable on a UDMA2 controller should be fine, at least upto 16x. The problems can start with most UDMA4 controllers and a UDMA 4 optical drive when you connect it with a 40 conductor cable. The signalling seems to get shrewed up and you get lots of errors. I’ve also seen the drive being said to be in UDMA4 mode with a 40 conductor cable, which is of course impossible.