[G4] FW: G4 Disk Capacity Limit - Real or Logical?

[shopdog at mac.com]

Hello everyone:

I have a PowerMac G4 AGP Graphics machine (the same one I've posted  
about before).

This machine, I believe, has the 128GB disk capacity limit, at least  
according to Apple's official stance.

I have a few questions that some of the gurus on this list might be  
able to answer:

1) I have the machine currently set up with 2 IDE hard drives, stacked  
in "Position 3" in the chassis: the original drive, 20GB (actually  
19.1GB), and a second, 120GB (actually 115GB). These are RAIDed  
together via OS X, into a 133.9GB combined drive.  I've been using the  
machine in this manner for over 2 years, with no ill effects.  Does  
this mean that there is a physical disc capacity limit of 128GB limit,  
but not a limit as to how many such 128GB physical discs can be RAIDed  
together to span their combined capacity?

2) There are two other spaces for hard drives, "Position 2" and  
"Position 1".  Although originally meant for SCSI drives, I believe  
these will accommodate IDE drives, but it is my understanding that the  
IDE bus will only allow 2 IDE drives in the chain.  Is that true?  If  
it is not true, what cables to I need to get in order to chain the two  
new drives to the previous 2?  If it is true, then how do I add 2 more  
drives?  With a PCI card, I suppose?  Are there any other ways?

3) Is it possible to purchase brackets to use in "Position 2" and  
"Position 1", so that those Positions will accommodate stacked drives,  
the way "Position 3" does?  Of course, I could pull the brackets from  
another G4 (which I don't have), but can the bracket be purchased  
separately, or is there a suitable substitute bracket?

3) Has anyone successfully replaced the internal Zip drive with an IDE  
drive?

4) Regarding these "hardware hack" commands on a previous post (from  
J.M.P. Hissell) to enable the higher disk capacity:

> ATA-2 commands:
>
> #! /bin/bash -
>
> if kextstat -lb com.apple.driver.KeyLargoATA | grep -F -q  
> KeyLargoATA &&
> ! ioreg -rStp IODeviceTree -n ata-2 -w0 | grep -F -q lba-48
> then read -rd $'\000' nvram nvramrc <<< "`nvram nvramrc 2>&-`"
> if sudo nvram 'use-nvramrc?=true' \
> nvramrc='dev mac-io/ata-2 0 0 " lba-48" property device-end'"  
> $nvramrc"
> then echo '48-bit LBA support will be enabled on the next reboot.'; fi
> fi

How are these commands actually implemented?  I've never attempted  
anything like this before.  If anyone could provide some detail, that  
would be great.

Thanks, everyone!