Hello,
Just wondering if anyone has any tips for enabling UDMA5.
I am currently using a 40GB WD disk that supports ATA100. This is under Fedora Core 1 with a ECS K7A5Spro mainboard. The SIS735 chipset, which this board uses, is supposed to support ATA100, but I can't seem to get it working.
When I check the udma transfer mode using hdparm here is what I get:
[root@squirt root]# hdparm -i /dev/hda | grep udma UDMA modes: udma0 udma1 udma2 udma3 *udma4 udma5
UDMA4 is currently the default transfer mode, but I want UDMA5.
I can enable it - be it briefly - by passing the -X69 switch to hdparm:
[root@squirt root]# hdparm -X69 /dev/hda /dev/hda: setting xfermode to 69 (UltraDMA mode5)
Yet no matter what, a few seconds later it will reset to UDMA4.
I have tried to add the -X69 to /etc/sysconfig/harddisks, but it still resets to UDMA4.
[root@squirt root]# cat /etc/sysconfig/harddisks | grep X69 EXTRA_PARAMS=-X69
Any suggestions? I doubt I would see much of a performance boost anyway, but just in case.
Thanks
Brian
