Hard Drive is UDMA3 instead of UDMA4

[Guest]

I have a hard drive that is showing as Ultra DMA Mode 3 (other times it shows
as Multi-Word DMA Mode 2) in the Primary IDE Channel Properties . I believe
this should be showing as Ultra DMA Mode 4, which corresponds to 66.7 MB/s.

Here is what I have in my system:
Windows XP
ABIT KT7 Motherboard (Supports Ultra DMA 66)
Maxtor 52049U4 (Google - UDMA 66) - attached to end of cable.
80 Conductor Cable

I talked with maxtor technical support and they told me that it is very
unlikely that a faulty drive would go down to UDMA 3, then to Multi-Word DMA
Mode 2.

I did a "Pause Break" at at bootup and found the following information:
First Screen: Maxtor 52049U4 DAC10SC0
Second Screen: Prim. Master Disk: LBA, ATA66, 20491MB

So it looks like at bootup the drive is detected as ATA66 but once in
Windows XP, it is beeing detected as UDMA 3 OR Multi-Word DMA Mode 2.

I installed the VIA Hyperion 4in1 version 4.43 (VIA Bus Master IDE
Controller Date 7/1/2001, Driver Version 5.1.3597.0.)

I also replaced the 80 conductor cable with another 80 conductor cable.

The drive still go down to UDMA 3 or to Multi-Word DMA Mode 2.

Appreciate your suggestions, on what else I can look for so that this drive
could be Ultra DMA Mode 4.

THANKS

 

[C J.]

I have a hard drive that is showing as Ultra DMA Mode 3 (other times it
shows
as Multi-Word DMA Mode 2) in the Primary IDE Channel Properties . I
believe
this should be showing as Ultra DMA Mode 4, which corresponds to 66.7
MB/s.

Here is what I have in my system:
Windows XP
ABIT KT7 Motherboard (Supports Ultra DMA 66)
Maxtor 52049U4 (Google - UDMA 66) - attached to end of cable.
80 Conductor Cable

I talked with maxtor technical support and they told me that it is very
unlikely that a faulty drive would go down to UDMA 3, then to Multi-Word
DMA
Mode 2.

I did a "Pause Break" at at bootup and found the following information:
First Screen: Maxtor 52049U4 DAC10SC0
Second Screen: Prim. Master Disk: LBA, ATA66, 20491MB

So it looks like at bootup the drive is detected as ATA66 but once in
Windows XP, it is beeing detected as UDMA 3 OR Multi-Word DMA Mode 2.

I installed the VIA Hyperion 4in1 version 4.43 (VIA Bus Master IDE
Controller Date 7/1/2001, Driver Version 5.1.3597.0.)

I also replaced the 80 conductor cable with another 80 conductor cable.

The drive still go down to UDMA 3 or to Multi-Word DMA Mode 2.

Appreciate your suggestions, on what else I can look for so that this
drive
could be Ultra DMA Mode 4.

THANKS

Hi ggalv...

Did the 80 pin drive cable come in the box with your drive?

Seems to me like I still have to use a 40 pin flat cable on one or two old
20+ gb Maxtor UDMA 66 drives I have. For your information a maxtor 52049U4
is an obsolete series 20.4 GB harddrive.

 

[dobey]

Hi ggalv...

Did the 80 pin drive cable come in the box with your drive?

Seems to me like I still have to use a 40 pin flat cable on one or two old
20+ gb Maxtor UDMA 66 drives I have. For your information a maxtor
52049U4 is an obsolete series 20.4 GB harddrive.

Do you have a slower HDD on the same IDE cable?
Try disconnecting and see what happens.

I seem to recall reading that if two different ATA mode HDDs share an IDE
ribbon the faster one will drop in speed to match the slower one. That may
be chipset dependant, though I seem to recall testing it out many moons ago,
and running a benchmark which confirmed it.