ROBY RU_128 BIOS: Trouble w. HPT366 + UDMA "4"

Wolfram · Post by **Wolfram** » Fri Jan 17, 2003 7:07 am

Hi everyone,

I had flashed the Roby RU BIOS with HPT V.128 and PIII support, just to check it out.

Then I got stuttering/sloppy sound when playing mp3s while the HD connected to the HPT was accessed. Also responsiveness decreased rapidly when I ran apps that do a lot of HD access like WinMX. Thought the new BIOS was to blame, and was ready to flash back to standard RU.

Then I noticed that the HPT reported the HD running in UDMA 4 Mode during bootup. UDMA 4 (100)?

Well, since the HPT366 can only manage UDMA 3 (66), this surprised me. So I changed the setting in the HPT BIOS to UDMA 3, and everything´s fine now.

I don´t remember if the standard RU BIOS also defaulted to "UDMA 4", but I didn´t have any problems when I had flashed it.

Post by **Derek** » Fri Jan 17, 2003 10:31 am

UDMA 5 is ATA 100. UDMA 4 is an accelerated ATA 66. Confusing, eh? But if you clocked it down to UDMA 33 and it solved a lot of problems maybe we should all try that

BCN · Post by **BCN** » Fri Jan 17, 2003 12:41 pm

I think UDMA3 was supposed to run at 48MB/sec bursts, right?

Wolfram · Post by **Wolfram** » Fri Jan 17, 2003 12:47 pm

Derek wrote:UDMA 5 is ATA 100. UDMA 4 is an accelerated ATA 66. Confusing, eh?

Uh-oh! Didn´t know that. Thanks!

I´m still not sure if this is just a problem of this specific BIOS. Don´t have the time right now to try that with the standard RU, but I´ll do that ASAP.

Wolfram · Post by **Wolfram** » Wed Feb 12, 2003 3:42 am

Forget all that I said, the BIOS isn´t the culprit. I found the solution of my problem and posted it here.