ATA66 Contoller Card

I've just purchased an ABit Hot Rod Ultra ATA controller card. Does it slow down the performance of this card when I install a couple of older disks (ATA33,MultiWord2) on the bus?

Awaiting answers

:-)
BrainwashedAsked:
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1cellCommented:
you mean:
1 ATA66 Drive
1 UDMA33 Drive?

yes, this will default to UDMA33 on both disks
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mikecrCommented:
No, it will not. As long as the card detects the drive as ATA/66, you are using the 80 wire cable that came with the controller card, and you install busmaster driver for the card, it will do 66mb transfers. Just because you are using an ATA/33 drive on the card does not mean that everything defaults to ATA/33! Each drive does independent transfers and one does not affect the transfer rate of the other. The system buffers these transfers to allow them to happen. This is why you install busmaster drivers for these cards. I do not reccommend though that you use PIO mode drives on the card as they may not be compatible with the drivers and may cause intermittent system lockups. If it works though, good luck!

Regards,
Mike
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1cellCommented:
hmm, interesting, the bus is shared correct?
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mikecrCommented:
1cell:   I don't understand what you mean by bus is shared? Hard drives use IDE Channels, controllers use system buses and IRQ's.



Each drive on a chain sends and receives data independently of anything else that is on the chain. The only thing that links them together is the cable. The controller card it designed to support the termination of signal which on a ATA/66 drive all 40 pins are grounded where they are not on ATA/33. The only actual time you would see a slow down on the IDE Channel would be when both drives are attempting to communicate with the system or each other at the same time. But this will happen on SCSI Channels also.
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BrainwashedAuthor Commented:
Mikecr: You interpreted my problem correctly. Everything seems to work perfect, and the drives are also detected as You described. The system seems to work faster than it did with the "normal" IDE-channels. I've skipped the thought of using my older disk. In near future I plan to purchase a RAID 0-controller instead. Do You know whether I then have to purchase a new disk identical to the other ATA/66 (same brand, type) ???

Much obliged

Brainwashed
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1cellCommented:
OK, I understand a bit more now I think.  Since the drives normally aren't being accessed at the same time, the performance wont be effected normally.  What I meant by the "bus" was that both drives going through the same card share the same path to the PCI slot and run through the same bus on the motherbaord.  I was thinking that this sharing would knock the ATA66 down to the common denomitator of the UDMA33.  It makes sense though, that if they aren't accessed at the same time that wont happen.  Thanks for clarifying.
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mikecrCommented:
1cell:    No problem.     The PCI bus normally runs a bit slower than the overall system bus but is still capable of speeds in excess of 128megabits per second. Unless your pounding the hard drives doing inter-drive transfers your speeds should be at top rate.

Brainwashed:   You can use any drive you want on your card as long as it is exactly the same size. Raid 0 is mirroring so the drive size will need to be the same but you can use any brand.

Good Luck!
Mike
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