Go to Compaq, find the support and then mail them. They have been quite helpful to me a couple of times. They probably know that their support pages sucks.
Then you can always use a drive that size anyway provided that it's ok to you having an extra layer between the drive and BIOS. Extra layer - in this case a special driver from the harddrive manufacturer. I've been using large drives together with different laptops this way. (IBM drives and their driver)
Go large!
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unicorn
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