How big of a HDD can this old PC support?

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Hello everyone.
I have a NAS on my local network with only one 6GB HDD on an old Pentium II 233 MHz with 128MB ram I think. I am using Linux based software called NASLite+ which has been forever great, never has let me down but now is time to get more storage.
No, I know this little software can support up to 4 HDD my question is, how big of a disk will this old PC support? Can I just buy a 1TB HDD and just try my luck? Or maybe buy 2 x 500GB or 2 x 250GB and try my luck?
By the way this is an old Dell Optiplex GXa.
Any advice is more than appreciated everyone.
Cheers,

 

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By the power of google I see your chipset supports ATA/33 plus INT13 so, 137GB is it not?