Slave drive, CDs, USB drives, Disk Images and FW drives fail to mount

Hi. I have two Maxtor internal hard drives (6Y160P0 and 6Y120P0), the second of which (6Y120P0) all of a sudden will not mount on the desktop. When I reboot my Mac, I get two identical error windows that state, “The disk you inserted was not readable by this computer”, with options to initialize, ignore, or eject. (There are no other drives of any type connected to the computer).
Within Disk Utility (when run from the primary hard drive), the slave drive shows up, but its icon is dimmed. Clicking the “Mount” button does nothing. Disk First Aid does not allow one to “Repair Permissions” nor “Repair Disk”, presumably since it won’t mount (eg, these options are dimmed). One odd aspect about Disk Utility is that the master and slave drive are listed as “disk0s10” and “disk1s10”, respectively, rather than the way they usually show up with the names I’ve given them. Yet on the desktop the working master drive shows up with its given name.
When I run Disk Itility from a CD, both internal drives look fine, accept repairs, and the drives are listed by their proper names.
As another interesting clue, all of the Disk Images (stored on the working master internal hard drive) that I have attempted to mount fail to open as well. When I doubleclick them, I get an error that reads, “The following disk images failed to mount: Reason: No mountable file systems”.
Two different USB keychains fail to mount; my FW drive fails to mount.
I’ve run Applejack Auto Restart without any difficulty several times.
Apple's Hardware check CD says all is AOK.
I’ve rebuilt this problematic disk (and the master) several times with Disk Warrior 3.03 and all is supposedly AOK.
SmartReporter says both disks are fine.
TechTool Pro 4.1.2 has run the following checks on the problem disk and these are AOK: Disk Controller, SMART, Read/Write.
All of this makes me wonder if the issue is with my system software, rather than the slave disk??? Interestingly, CDs refuse to mount as well when I've booted from the primary hard drive (but I don't think it is the CD drive itself since I can boot from the CD drive). This, coupled with the fact that disk images won't mount, makes me now think it is an OS issue rather than hardware.
Any suggestions about what I can do to salvage and fix this problem would be greatly appreciated!
G4/867MHz running OS 10.4.8

If anyone else is having this problem, check out the totally awesome post by GNJ to my similar query on the MacFixIt forums:
Drives and Disk Images refuse to mount
http://www.macfixitforums.com/showflat.php?Cat=&Board=tiger&Number=791320&Forum= &Words=CharPatton&Match=Username&Searchpage=0&Limit=25&Old=6months&Main=791320&S earch=true#Post791320
His suggestion to run the 10.4.8 combined PPC update worked like a charm and solved the problem perfectly!
PS If you are having the same issue, there is the problem that one can't use a USB/FW drive to get the combo updater onto the problematic hard drive, and even if you can, the faulty software won't allow one to mount a .dmg image. This can be solved by using "Target" mode, eg connect the problematic CPU to a working CPU (in this case, my PowerBook) via a FW cable, then boot up the problem CPU while holding down the letter "t". One can then drag the combined updater unstuffed file (eg, not the .dmg) directly to the problematic disk from the working CPU. Then, when I booted in the problematic disk/CPU, all it took was a doubleclick on the unstuffed updater and all was fine.

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