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Last Login: 3/4/2005 7:16 AM
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| I have a P4 1.8Ghz with ASUS P4S333-M this IDE configuration:
CHANEL 0 => 40GB HD master and 30GB hd slave
CHANEL 1 => CD-RW master and CD-ROM slave
If I swap the 30GB HD with CD-ROM, I will have a better perfomance? I think is the best configuration, so I don´t mix same devices in the same chanel!! What you think about??
All devices are running in DMA mode.
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| Depends on what you're using the drives for. For example: CD to CD copies will get better performance if the drives are on seperate cables.
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| Under normal usage, you want to keep the HD's on one channel and the opticals on the other. Harddrives operate at a higher transfer rate generally, and if you put a slower CD-ROM drive on the same channel as a harddrive, the harddrive will run at the speed of the slower CD-ROM drive.
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| ....the harddrive will run at the speed of the slower CD-ROM drive.
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Vector: ?? ...and in machines with only one chanel/cable??
Relder: make sense your answer. I use it to copy CD to CD, in many cases. If I install the CD-RW on 2nd chanell and the OS in the 1st, maybe the performance ups, when copy files from C to RW!!
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| I don't think I've ever seen a motherboard without a primary and secondary IDE channel. The primary IDE channel pin connection is usually BLUE. I have always run my CD-ROM and CD-RW on the same channel and haven't experienced any problems. The problem, as Vector stated, is that with an Optical drive on the same channel as the HDD it will operate slower. CD drives operate at DMA mode 2 which is 33MB/s, and most newer HDD operate at DMA mode 5 or 6 which is 100 or 133 MB/s. Having the CD on the same channel will slow the HDD down.
Write your questions down on the back of a $20 dollar bill and send them to me.
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| I have always heard that putting optical drives on the same cable as hard drives will slow the hard drives down, but in a recent issue of Maximum PC (not sure which month) they decided to put it to the test. After running speed tests they concluded there was no slowdown.
Has anyone here ran any tests to check if this slowdown still exists? |
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| vinceione,
Most of the latest chipsets support stepping down of the transfer rate on the IDE bus when communciating with older devices ATA33 or ATA66 for example. The faster UDMA devices still communicate at full speed.
Performance is still impacted though as the ATA channel supports 2 devices and each device operates independantly. Therefore if a slow device is on the same channel as a hard disk, perfomance will be impacted slightly as the hard disk has to wait for the request to the slower device to complete.
Cheers
Andy
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| So would it be correct to conclude that...
- for OPTIMUM performance when doing "regular work" and burning from HDD to CD, the devices should be positioned in such a way that different throughput speeds are separated from each other; examples:
IDE 1 M -- HDD UDMA 33
IDE 1 S -- CD-RW UDMA 33
IDE 2 M -- HDD Multiword DMA 2
IDE 2 S -- CD-ROM Multiword DMA 2
IDE 1 M -- HDD UDMA 100/133
IDE 1 S -- HDD UDMA 100/133
IDE 2 M -- CD-RW UDMA 33
IDE 2 S -- CD-ROM UDMA 33
- for OPTIMUM performance when MAINLY copying CD's on the fly, the CD-ROM and CD-RW should be on separate channels, no matter the throughput speed differences of devices that will be on the same channel as a result; to re-arrange the second example from above:
IDE 1 M -- HDD UDMA 100/133
IDE 1 S -- CD-RW UDMA 33
IDE 2 M -- HDD UDMA 100/133
IDE 2 S -- CD-ROM UDMA 33
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