esata is the 100% the same as internal sata. thats why it kicks so much ass;)
but hey, BT!
i think there may be a chance you have forgotten to change the type of partition map its using
GPThttp://en.wikipedia.org/wiki/GUID_Partition_Tableif its partitioned in the GUID partition map, this drive is only bootable with intel pcs / macs / EFIbios machines
MBRhttp://en.wikipedia.org/wiki/Master_boot_recordif its partitioned in the MBR partition map, this drive is only bootable with windows machines
APMhttp://en.wikipedia.org/wiki/Apple_Partition_Mapis what is needed to be formatted 100% compatible with os9.. this probably slipped by you as all new harddrives these days are
shipped with GUID partition map type..
even tho u have changed the size of the partition map it doesnt change the type unless u specify this in the hidden menus or command switches
in mac os X u have to click a 'customize' or 'more options' button to see this dialog (disk utility)
if the partition map is done in Apple partition map then mac os 9 + mac os x ppc should see the drive exactly the same
as well as be bootable from both.
another thing u could use is GPARTED which is a partition editor built under Ubuntu.. not sure if they would have a powerpc bootable iso of this
this was suggested to me by another use of macintoshgarden so i would think he found a downloadable cd image from somewhere
but its alot easier to just use disk utility if u have X installed.
changing the partition type under mac os 9 is impossible...
mac os 9 doesnt give u the option to change from GUID to MBR to APM unfortunately
**UPDATE
i just found this info :
LARGE 3 or 4 TERABYTE DRIVES IN YOUR G5
Apple Partition Map only allows partitions of 2.2TB. That means if you attach a 3 or 4 TB drive to your G5 it will not work properly although it might appear so. Once you fill that drive above that 2.2 TB level the drive will lose its mind. You can simply partition the large drive into multiple partitions less than the 2.2TB limit. You can use 3 or 4 TB drives in a single partition on a G5 as a DATA only drive by simply partitioning it as GUID. The GUID partition doesn't have the limitations of the Apple Partition Map setup. You will not be able to boot from the drive however.
so it could be apple partition map that is capping u at 2.2TB..
so there u go.. u can make it a 4tb drive by using GUID partition map... but that may be usefull only for X... im not sure if mac os 9 can see GUID type drives? it certainly cant boot from them, this is certain... but it may be able to use them as a data drive?
i was just about to suggest MBR, but that also caps out at 2tb
2 TB
The organization of the partition table in the MBR limits the maximum addressable storage space of a disk to 2 TB (232 × 512 bytes). Therefore, the MBR-based partitioning scheme is in the process of being superseded by the GUID Partition Table (GPT) scheme in new computers.
like the quote from headgap systems says... it will "appear to work" at first but "Once you fill that drive above that 2.2 TB level the drive will lose its mind." this is not what u want to have happen.... my advice.. dont use the 4tb drive with the g4 mac.. take it back to the store if u just bought it and get a 2tb drive.. (and take the difference u save and buy a sandwhich LOL right diehard?
) stay within the 2.2TB range.. have a bootable proper apple partition drive that is 100% compatible with the machines.. i would suspect even if u do 2 or 3 partitions.. something is bound to go realy wrong as you are going past into "unknown territory" as mactron would say.