The setup capture process adds the SandboxName parameter to the Package.ini file. If you capture Firefox and Mozilla Firefox 3.0 is the value of this parameter, the default location of the sandbox for the application is %AppData%\Thinstall\Mozilla Firefox 3.0. The typical %AppData% location is C:\Documents and Settings\<user_name>\Application Data. %AppData% is often mapped to a shared network drive.

You can store the sandbox on a network or on a portable drive.