Big hard drive in 400 iMac

I repair and set up iMacs for donation and recently was setting up a 400 Graphite for donation to a video project. It originally had a 12GB HD in it and I told the client if he wanted a larger HD he should get one for me to put in. I told him about the 128GB size limitation but he comes back with a WD 250 GB Caviar saying that the price is so close it doesn't matter.
So I go to format it in the iMac and sure enough it sees it as a 128. I think aha I'll put it in my G4 Sawtooth but same thing they're all like that until the G4 Quicksilver.
But then I thought what if it's in an external drive and formatted that way. I put it in an external USB case plug it into the iMac and start up with the install CD for Panther and WOW Disk Utility sees it as a 250 GB drive. So I partition it into 2 parts which Disk Utility sets at 2-112 GB partitions.
I put it back into the iMac and now it sees two drives. I installed Panther on the first partition and wrote some apps to the 2nd drive. It works fine.
Now Disk Utility sees this:
WD HD 128 GB
Partition 1 116.3 GB 113.3 GB available (OS installed)
Partition 2 11.4 GB 116.3 GB AVAILABLE!
It's running with no problems but my question is does anyone think this will cause some kind of problem down the line?
I'll recommend he puts 1 GB of memory in it also. It's got 6xx in it now.
Richard

The 128 GB limitation pertains to drives, and not to volumes or partitions. Partitioning schemes have never been known to be a successful workaround, for the onboard IDE controller's lack of support for 48-bit LBA, required for large drive recognition. The second 112 GB partition that you created spans the 128 GB point of no return. After you've used about 16 GBs of storage capacity on that partition, data that's written beyond the 128 GB point may be AWOL, when you attempt to retrieve it later. This would undoubtedly create a future headache, for someone using this iMac for the video project that you mentioned. The only successful software solution to the 128 GB limit is InTech's SpeedTools High-Cap Driver, but it has guidelines that must be followed regarding partitioning. If given the choice, I'd install the 250 GB drive in a FireWire enclosure, to ensure dependable operation.

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