I think that changed some time ago (I think it was in the times of ATA33).The fastest any device will ever run on that channel will be whateverI don't believe this is true any more.
the slowest device is. So even if you never use the CD/DVD drive, your hard drive will be limited to the speed of the CD/DVD drive.
hda - ATA133 hdb - ATA66 hdc - ATA133 hdd - PIONEER DVD-RW DVR-105 (/dev/scsi/host1/bus0/target0/lun0/cd)
hdparm -t /dev/hda /dev/hda: Timing buffered disk reads: 124 MB in 3.03 seconds = 40.92 MB/sec
hdparm -t /dev/hdb /dev/hdb: Timing buffered disk reads: 38 MB in 3.14 seconds = 12.10 MB/sec
hdparm -t /dev/hdc /dev/hdc: Timing buffered disk reads: 126 MB in 3.02 seconds = 41.72 MB/sec
Peter
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hmmm - I wonder if that is a recent change? I'm still on 2.4.20 and this is my hdparm -v -i
I think the point her is that the slave cannot be faster than the master.
UDMA modes: udma0 udma1 udma2 udma3 *udma4 UDMA modes: udma0 udma1 udma2 udma3 *udma4 udma5
First is my 13 gig primary and second is my 30 gig secondary. I'll have to triple check the cable when I get home to make sure that's not the bottle neck. I know the board will do ata/100 since I had that drive on the other channel before I bought a dvd drive and it was doing it there.
One note as to the way to connect your devices. I have 2 disks both ATA100, 1 DVD and 1 CD-RW (both ATA33)
In my former system I had the disks as masters on the 2 IDE channels and the DVD/CD as slaves. Now, due to cable length problems I have both disks on one channel and the same for DVD/CD.
Copying between both disks is noticably slower (due to the fact that IDE can not address both drives at the same time).
Before I had my partitions split , in a hopefully intelligent way, across both drives, this doesn't speed up my system now anymore.
Christian
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