maxtor ATA133 disk is set at udma2 (ATA33 ?)

guest · 09-03-2003, 01:20 AM

I have Dell Dimension 4600 and I enable DMA on my Maxtor (6Y160P0) 160 GB disk. The problem is that udma is set to udma2 (ATA 33) instead of ATA 100 that intel motherboard is supposed to support. This is RedHat 9.0 running RedHat's 2.4.20-20.9 SMP (on HyperThreaded P4).

par of output from hdparm -i /dev/hda:

Model=Maxtor 6Y160P0, FwRev=YAR41BW0, SerialNo=Y426BJJE
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2

Because of this my 30GB hdb is also set at udma2:

Model=Maxtor 6E030L0, FwRev=NAR61590, SerialNo=E1C04M7E
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5 udma6

I wonder what is going on wrong.. is my hard disk lying?

Thanks,
Raghu.

sud_crow · 09-03-2003, 01:43 AM

Hi,

well i dont know why your 30gb is set to UDMA2, it maybe due a wrong recognition of your chipset or the IDE drivers, about the otherone, as you see it detects as far as UDMA2, not to 6 as the other, this is becouse you have the 80pin IDE cable connected to the 30 and not to the 160gb one (it may be the same cable but different connector). For example my ASUS mother brought one IDE cable that had only one of the two connectors supporting udma3 and above, so, check your cable connections and mother specifications.... im currently running in udma2 also, becouse i dont have a 80pin cable (i broke it playing around.. ;() (anyway, mines are a 15 and 20gb ata66/100)

hope it helps, good luck.

guest · 09-03-2003, 01:50 AM

Thanks,

I tried that same connector I used for 160 GB on 30 gig disk and it shows proper udma6. Only the 160 GB shows only till udma2

The connector does not seem to be the problem.

Raghu.

guest · 09-03-2003, 02:43 AM

OK, the culprit was the Dell BIOS.

For some reason, Bios setting for "Primary Slave" was set to "OFF" instead of "AUTO". So set it back to AUTO and everything is fine.

But not sure why Bios setting of "OFF" for primary slave resulted in udma2 for the primary master.

Now both the disks are set at udma5 which I think is ATA100. hdparm shows a cool 56MB/s.

[root@sapphire raghu]# hdparm -Tt /dev/hda

/dev/hda:
Timing buffer-cache reads: 128 MB in 0.15 seconds =853.33 MB/sec
Timing buffered disk reads: 64 MB in 1.13 seconds = 56.64 MB/sec

sud_crow · 09-05-2003, 11:55 PM

glad you got it working...
im at a mere 25mb/s .... ;(