DMA modes

vbimport

#1

My drive produces error in Ultra DMA mode 4, due to a firmware bug in many Pioneer drives, so I put it down to “Multi word” DMA 2.

How will this effect it’s preformance? I have a 16x speed DVD writer, so will it prevent me from reaching the high speeds?

Can someone please explain what PIO, DMA, “Multi word” and Ultra DMA are to me?

Should I be concerned that it doesn’t reach Ultra DMA modes? Will an update to my motherboard BIOS correct the situation?


#2

should work fine in udma 2, you can test your burst rate using cd/dvd speed so long as you get over 20 you`ll be ok


#3

No not UDMA mode 2. Just DMA mode 2

I got 14 with a DVD+RW and 13 with a Data CD.

What is the burst rate?


#4

its the rate at which data can be read from you drive.

i don`t know if using a RW will give lower readings try it with a dvd R.


#5

With a DVD-ROM I get 14 MB/s

WHat if I set it to a weird UDMA mode?


#6

I tried Ultra DMA mode 2 (It is ussposed to be 4) and it seemed to work fine. When I went to Ultra DMA mode 4 it gave me a Logic unit communication crc error. Does using Ultra DMA modes that were no specified as supported by the product hurt?

Oh I see. 80 pin cables are needed for Ultra DMA modes above 2


#7

Solved. It supports: Ultra DMA modes above 2

Ultra DMA modes above 4 requires an 80 pin cable. Upon opening my computer I see only my hard drives have it.