I have ben trying stuff out and there is always that 2.21 GB limit .
I tried the hdiutil command, as well as the hdid command, plus two
applications, and the limit is always the same.
You will notice that it works for 4661736 sectors but not for 4661737
sectors, so there is your limit…
I have attached a .zip with screenshots of the terminal
> I got a response from peter hosey, maker of a RAM utility, that
> actually exploits a hdiutil feature.
> it is documented here
> all you need to try is the hdiutli command in Terminal, like
> hdiutil attach -nomount ram://16000000
> to see if this will create a 8000000000 byte ram disk.
> I would love to see what this does.