Hi Henry,
You can replace that hard drive with any 3.5" EIDE hard drive of any capacity. Here's a link on Amazon for an 80 GB for about $30: >> Click Here <<
If you want to search for other drives, use the search term: 3.5" EIDE hard drive
The most trusted brands on the market are currently Seagate and Western Digital.
Hope this helps!
SOURCE: I WANT TO REPLACE MY 40G HARD DRIVE ON MAC G4
You have mentioned that you are looking at replacing the hard drive with a SATA one. Since the G4 iMacs use PATA hard drives (an older standard) you will have to make sure that the drive you use is a PATA.
Aside from that, you should be able to upgrade to a reasonably large hard drive up to 500GB and then format the drive for a mac.
The only real trouble you will have in my opinion will be the installation as the process for taking apart a G4 iMac is very advanced. There are a few guides on how to do this, just make sure that your skill level is advanced enough to attempt the upgrade. Also, of course, make sure you have backed up all of your data and everything before you start... that can mean a world of difference to you later on if anything goes wrong.
I would personally take a trip to the Apple store and talk to a genius about this sort of upgrade, or look at other upgrade options such as a bigger external hard drive because there are many complications in this upgrade and those two options are easier.
If you are interested in attempting the upgrade yourself you can look at this explanation of the process, it is quite thorough and has pictures showing internals and the process. http://www.xlr8yourmac.com/systems/imac_g4/imacg4_takeapart.html
If at the end of that you want to go ahead and open your box up by all means do and I will be here to offer as much support as I can.
Regards,
Jack
Here is a picture I found that shows the jumper settings for:93 views
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