If you mean that you want to set up the script on a seperate server hard drive, then that is beyond the scope of our support as that is a server setting which is nothing to do with the script itself.
It could be a setting in the server control panel for the domain, dependant on the OS/control panel.
Do you want to have script installed on Server 1 HDD and Server 2 HDD?
or
Do you want to have script installed on Server 1 HDD, and uploaded files sent to Server 2 HDD?
Both are possible. Support can show you the documentation to configure these both.