Maximum size possible of hard disk in my IMAC G5 20 inch?

I am using an IMAC G5, 2GHz with a 400 Gb hard disk.
I would like to buy a larger disk, 500 Gb minimum or even 750 Gb.
- What is the maximum size the IMAC can handle?
- Where would I find a document on apple.com to provide further details on the hard disk specifications?
- what is the interface in use for the disk?
thanks in advance for your help.
Patrick

Bonjour,
The iMac G5 uses the Serial ATA (SATA) interface in the standard desktop 3.5" size.
You can install any capacity of drive you can buy on the market today.
Installation Instructions (4.5Mo).
mrtotes

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