not attaining ultra dma mode x

  • Thread starter Thread starter WildBil
  • Start date Start date
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WildBil

I have a wd1200JB drive. Mfr claims the drive is capable of mode 5
ultra ATA, mode 4 etc.

XP claims (in Device manager ide controllers) that the transfer mode
is ultra DMA Mode 2 (with the drive installed in a Dell Precision
670). The drive is installed as a "single" with no other drive
attached to that ide connector. The bios is set to disregard
acoustics so I don't believe the disk rotation is being limited. While
I have not tried changing the cable, I have tried changing the cable
position on the motherboard from one ide board connection to the other
(swapped ide1 with ide2).

What is odd is that a very much older wd drive
(WD 136BA) is listed in XP as providing DMA Mode 4.

What could I be doing wrong in order to not get a
higher transfer mode?

Thank you for listening,
Bil
(e-mail address removed)
 
I have a wd1200JB drive. Mfr claims the drive is capable of mode 5
ultra ATA, mode 4 etc.

XP claims (in Device manager ide controllers) that the transfer mode
is ultra DMA Mode 2 (with the drive installed in a Dell Precision
670). The drive is installed as a "single" with no other drive
attached to that ide connector.   The bios is set to disregard
acoustics so I don't believe the disk rotation is being limited. While
I have not tried changing the cable, I have tried changing the cable
position on the motherboard from one ide board connection to the other
(swapped ide1 with ide2).

What is odd is that a very much older wd drive
(WD 136BA) is listed in XP as providing DMA Mode 4.

What could I be doing wrong in order to not get a
higher transfer mode?

Thank you for listening,
Bil
(e-mail address removed)
Click to expand...

I have figured out the problem. It is a cable issue. One is an older
40 wire flat cable. the other is a newer 80 wire flat cable. The
signal must degrade in the older cable resulting in signal
degradation. by switching cables I can then make the new drive attain
mode 5 and the old one mode 2 while before that the new drive was
mode 2 and the old one was mode 4 (its highest attainable transfer
rate)

bil
 
I have figured out the problem.  It is a cable issue. One is an older
40 wire flat cable. the other is a newer 80 wire flat cable. The
signal must degrade in the older cable resulting in signal
degradation.  by switching cables I can then make the new drive attain
mode 5 and the old one mode 2 while  before that the new drive was
mode 2 and the old one was mode 4 (its highest attainable transfer
rate)

bil
Click to expand...

For your info: The 80 wire cable uses one wire to shield the data
wire from interference.
 
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