bit wrote:
Am Samstag 01 Mai 2004 01:18 schrieb Alexander Dalloz:What are you using for a drive cable? UDMA/cable select, or the old 40 pin cable?
Am Sa, den 01.05.2004 schrieb Guolin Cheng um 00:51:
Hi, William,
Thanks.
Then how to increase PCI IDE disk speed through adjusting PCI bus speed? What I've said is: even I tried to improve PCI bus speed by specifying "idebus=66", the sustainable PCI IDE disk data transfer speed is still about 33MB/s, while the hard disks themselves may be capable of providing higher speed. Thanks.
I definitely know apple and orange, both fruits are my favorite. :)
Guolin Cheng
Do not play with idebus=XX setting, it's pointless. Instead run "hdparm -i /dev/hdX" where X is the drive letter. It will print with which mode and at which speed rate the drive actually works:
PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
This example shows the drive is capable or PIO mode, DMA modes and UDMA modes. And it shows that the current mode and speed is UDMA5.
Using "hdparm -i /dev/hdX", I found out, that both of my hard drives run in udma2, while they are capable of udma5.
PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5 AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1:
I didn't investigat this any further, apart from reading the hdparm man pages, but is it advisable to change from udma2 to udma5 in a completely installed and configured OS generally (or FC1 in special) ?
Sorry for hijacking the thread, but I felt it was kinda "apropriate". :-)
Thanks for any help.
the 80 trace cable must be used for the higher speeds.
What is the controller you are using? I assume ultra, but need to be sure.
What is the BIOS setting?. If not set to ultra it will not work any faster.
Alexander
Have phun, bit
