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Question things about IDE host and IDE controller

  #1  
Jul 15th, 2006
Does the ide controller exist in the hard disk itself and only the IDE host exists in the PC mother board?

If yes than how can I find out that how many IDE hosts my mother board had and how many hard disk I can connect to each ?

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Re: things about IDE host and IDE controller

  #2  
Jul 15th, 2006
Originally Posted by ide
Does the ide controller exist in the hard disk itself and only the IDE host exists in the PC mother board?
The host controller circuitry resides on the motherboard, or in the case of an IDE/ATA accellerator/expansion card, on the card. The drive controller circuitry is (obviously) on the drive.

Originally Posted by ide
how can I find out that how many IDE hosts my mother board had
Look on the motherboard or consult your motherboard's documentation. Traditionally there are two IDE channels (Primary and Secondary) on a motherboard.

Originally Posted by ide
and how many hard disk I can connect to each ?
You can connect a maximum of two devices to any given IDE channel.
Last edited by DMR : Jul 15th, 2006 at 5:23 pm.
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Re: things about IDE host and IDE controller

  #3  
Jul 15th, 2006
Originally Posted by DMR

Look on the motherboard or consult your motherboard's documentation. Traditionally there are two IDE channels (Primary and Secondary) on a motherboard.


I see many 40 pin cables coming out of the motherboard to which I can connect hard disks, does each of them represent a IDE channel ?
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Re: things about IDE host and IDE controller

  #4  
Jul 15th, 2006
It really depends on the exact model of your motherboard. Do you have any info/specifications for the motherboard?
Last edited by DMR : Jul 15th, 2006 at 6:24 pm.
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Re: things about IDE host and IDE controller

  #5  
Jul 15th, 2006
Here is the main board info

Board: Hewlett-Packard 085Ch
Serial Number: SGH442011L
Bus Clock: 800 megahertz
BIOS: Hewlett-Packard 786B2 v1.11 07/10/2003


and this is the controllers info

Standard floppy disk controller
Intel(R) 82801EB Ultra ATA Storage Controllers - 24D1
Intel(R) 82801EB Ultra ATA Storage Controllers - 24DB
Primary IDE Channel [Controller] (2x)
Secondary IDE Channel [Controller] (2x)


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Re: things about IDE host and IDE controller

  #6  
Jul 17th, 2006
I couldn't find specs for that particular motherboard, but from what you posted, you appear to have (2) 82801EB controllers on the motherboard. Each 82801EB controller has a Primary and a Secondary channel, so you should see 4 IDE/ATA connectors on the motherboard. Does that sound about right?

Since each channel of each controller can handle two drives, it looks like you should be able to connect 8 drives to that system.
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Re: things about IDE host and IDE controller

  #7  
Jul 19th, 2006
thanks a lot for your help, the one from which I posted the specs is my office pc so I don't want to open its case

however in my home pc I see only

Primary IDE Channel [Controller] (2x)
Secondary IDE Channel [Controller] (2x)


and it has two ide cables, so you are right
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Re: things about IDE host and IDE controller

  #8  
Jul 20th, 2006
Originally Posted by ide
and it has two ide cables...
Right- one cable for the controller's Primary channel, one cable for the Secondary channel. That means that you can connect two drives to each cable for a total of 4 devices.
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Re: things about IDE host and IDE controller

  #9  
Jan 23rd, 2008
which side of an ide cable should be nearest to the power supply on the hard if anyone could help that would be nice .
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Re: things about IDE host and IDE controller

  #10  
Jan 23rd, 2008
Originally Posted by coolamd View Post
...nearest to the power supply on the hard...

There is no power supply on the hard drive itself, but if you mean the power connector, then the side of the cable which has the colored stripe along it would conventionally be nearest that connector. The stripe marks the cable's #1 wire/pin, and that should correspond to Pin #1 of the drive's IDE connector.

You can (and should) check the drive manufacturer's website for cabling/connection info for the specific model of drive, because the orientation of the IDE cable may not be as I described for every make/model of drive.
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