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Max number of physical disks

home made
May 10, 2006 at 10:55:13
Specs: w2k-sp4 & xp-sp1, Intel P4 - 2.8Ghz /1 GB

I have an Asus P4P800 Deluxe on which are connected two dvd burners on one IDE channel and two IDE disks on the other IDE channels. I have two additional IDE disks connected to a Promise Ultra Storage Controller Card (it's too late that I discovered that I could have used the RAID controllers).

When I connected temporarily a SATA disk on the MB plug, my two optical readers were not recognised any more. Does this mean that the MB will only accommodate a maximum of 6 physical disks?


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#1
May 10, 2006 at 11:42:53

Dunno the maximum number of HDs that Asus can support. Why not go with SCSI? With SCSI you can connect up to 32 or 34 peripherals (HDs, scanners, etc) in a daisy chain arrangement.

i_XpUser


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#2
May 10, 2006 at 12:29:26

It could be that you can use either the IDE channel or the SATA channel but not both at the same time. (Kind of like how some computers circa 1999 had an ISA and PCI slot next to each other, but you could only use one of them.)

I think I remember seting something where a guy hooked up a bunch of IDE controller cards and some scsi cards to get 24 physical hard drives under Windows 95. (XP should support more since you are not required to have assign a drive letter and can use mount points instead.)


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#3
May 10, 2006 at 13:56:55

The problem is not with the xp OS exactly.

See the bios setup first for clues as to what is going on. In most cases the bios must correctly read the drives and report to the OS. Make sure that your system supports the combo you choose. There is no need for more hardware unless the system is real odd.

Then after bios is correct (might have to get bios update if exists that tells about this) then you might have to move on next to what xp is doing.


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#4
May 10, 2006 at 16:29:43

"When I connected temporarily a SATA disk on the MB plug, my two optical readers were not recognised any more. Does this mean that the MB will only accommodate a maximum of 6 physical disks?"

No that means your MB can only support 3 controllers [ide1, ide2, promise]. There are limited irqs and base io address available. Engage another controller and someone is going to lose their irq/io address to the other controller.

The trick then becomes to disable everything in the bios not being used. if using USB for keyboard/mouse diable com ports and keyboard port. if not using builtin firewire disable it. See if there is a "reset nvram settings" or similar that you switch from "no" to "yes". This will force the mb to reread the resource allocations and perhaps assign them to your additional hardware.

Give a person a fish, they eat for a day. Suggest they internet search and they learn a skill for a lifetime.


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#5
May 21, 2006 at 05:25:42

Thanks for the tip, i'll give it a try

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