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#1
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Should'nt have HDD's and Optical Drives on same IDE, But...
I,ve read on a PC building site that one shouldn't put an optical drive
(such as CD or DVD) on the same IDE connection because that will force the Hard drive to run at the slower speed of the Optical drive. OK, but if there is a CD drive on the same IDE connection with a DVD drive, will that force the DVD drive to run at the slower speed that the CD drive runs at ? |
#2
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Should'nt have HDD's and Optical Drives on same IDE, But...
"Dave" wrote in message link.net... I,ve read on a PC building site that one shouldn't put an optical drive (such as CD or DVD) on the same IDE connection because that will force the Hard drive to run at the slower speed of the Optical drive. OK, but if there is a CD drive on the same IDE connection with a DVD drive, will that force the DVD drive to run at the slower speed that the CD drive runs at ? No, also with high speed busses at this point, mixing HD and optical is becoming moot. |
#3
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Should'nt have HDD's and Optical Drives on same IDE, But...
"Dave" wrote in message link.net... I,ve read on a PC building site that one shouldn't put an optical drive (such as CD or DVD) on the same IDE connection because that will force the Hard drive to run at the slower speed of the Optical drive. OK, but if there is a CD drive on the same IDE connection with a DVD drive, will that force the DVD drive to run at the slower speed that the CD drive runs at ? Two drives on the same cable will run at the same IDE speed. This isn't a problem though, as hard drives and other drives are still struggling to catch up to ATA66 interface speeds. In other words, "slowing down" the interface speed is not a problem. -Dave |
#4
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Should'nt have HDD's and Optical Drives on same IDE, But...
Dave wrote:
I,ve read on a PC building site that one shouldn't put an optical drive (such as CD or DVD) on the same IDE connection because that will force the Hard drive to run at the slower speed of the Optical drive. OK, but if there is a CD drive on the same IDE connection with a DVD drive, will that force the DVD drive to run at the slower speed that the CD drive runs at ? If you have an ATA 100 device with an ATA 133 device on the same bus, the bus will run at ATA 100 transfer rates for both drives. The speed of the drives, eg whether they are 64x or 1x, matters not - if they are both ATA 133, the bus will run at ATA 133 transfer rates for both of them. You can run a CD/DVD on the same cable as an HDD, if they are both in DMA mode and both are the same ATA rating, without adversely affecting the HDD. The slower reading rate (which is determined by the 1x 64 x rating of the drive) simply means that the CD/DVD grabs the bus for transfers less often than an equivalent HDD would do. Thus a pair of hard disks is better split between the two IDE cables - provided anything else on those cables has the same ATA 100/ ATA 133 rating as the HDD and is running in DMA mode. However, if the CD/DVD is not in DMA mode then the processor has to poll it for data, which will result in additional bus activity which will impact on the performance of an HDD on the same cable. If the CD/DVD is not in DMA mode, it should not be put on any cable with a HDD or anything which can run in DMA mode. Just about the worst thing you could do is to put an ATA 133 HDD on the same cable as a non-DMA ATA 33 CDROM..... -- HTH Sue |
#5
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Should'nt have HDD's and Optical Drives on same IDE, But...
DVD drives and CD drives transfer data in the same general realm of speeds,
which is MUCH less than current harddrives do. So the instructions you read are correct. -- DaveW ---------------- "Dave" wrote in message link.net... I,ve read on a PC building site that one shouldn't put an optical drive (such as CD or DVD) on the same IDE connection because that will force the Hard drive to run at the slower speed of the Optical drive. OK, but if there is a CD drive on the same IDE connection with a DVD drive, will that force the DVD drive to run at the slower speed that the CD drive runs at ? |
#6
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Should'nt have HDD's and Optical Drives on same IDE, But...
Thanks ALL for your input.
"Dave" wrote in message link.net... I,ve read on a PC building site that one shouldn't put an optical drive (such as CD or DVD) on the same IDE connection because that will force the Hard drive to run at the slower speed of the Optical drive. OK, but if there is a CD drive on the same IDE connection with a DVD drive, will that force the DVD drive to run at the slower speed that the CD drive runs at ? |
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