Hey this is kinda good. I have the same problem so I know its just not me.
I have a 40gig and a 60gig both on the master ide cable, its an ata100 cable. The 40 gig is the older drive, being about a year older than the 60 though I can't place when I bought them. I used the suggester to get powermax, and sure enough the 40 shows a FAIL on the smart test.
What my computer does is like 10% of the time on a cold boot (especially in the morning after having a good 8-10hrs of downtime) the harddrives will hesitate to be recognized by the bios. The bios will sit there waiting, and most the time the hard drive or drives (i can't tell if its one or two of them taking their time) will spin up and be recognized. Sometimes the bios gets sick of waiting and only picks up the cdroms and has a boot fail, which I have to reboot again. When the drives do spin up or they have been running, they work flawlessly. I dont know what it is. I have a feeling the 40gig is dragging down the 60gig, cuz they are either both detected or both ignored.
To the original poster of this thread: Do you have both hard drives on the same channel? and if so does one get recognized sometime and not the other?
I am probably gonna do an advanced RMA through maxtor, as they will get me a new drive before I have to send this one out. I doubt its the cable, maybe the hard drive is just starting to die from the years of hard use. Let me know if anyone finds anything else out.