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I need to replace one of my internal drives and am looking to go for a 750 GB or 1 TB drive. I can't find any reference to there being a max size and don't think there is but thought I would double check before dropping the $$. Can someone confirm concretely one way or the other?

Thanks!

[Lateralus]

A max has not been reached yet.

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Beauty, as I had hoped. Thanks!

[Big Mac]

Accelerate Your Mac has a great database of user reports on hard drive compatibility:

Accelerate Your Mac! Mac Drive Upgrades/Compatibility Database

However, it looks like there aren't submissions on TB drives in G5s yet, so you may have to look elsewhere.

[reader50]

If the G5s fully implement the LBA-48 spec, then the max addressable HD space is 128 PetaBytes. There is another limit we will run into sooner, unless Apple releases a firmware update.

The Apple Partition Map can handle a maximum disk size of 2 TB. The GUID partition scheme can go much higher, but PowerMacs cannot boot from a GUID partition scheme. So until/unless Apple releases a firmware update, a boot drive in a PowerMac will be limited to 2 TB.

Larger drives could be installed, but would ignore the extra space if they are partitioned with APM. A larger drive with GUID would work fine as a data disk.