The present invention relates to computer-implemented method for generating one or more system calls from a command originating from a software process. The method comprises the steps of receiving the command from the software process; translating the command into a first set of system calls for execution by an operating system; intercepting said first set of system calls prior to execution by the operating system; and replacing said first set of system calls with a second set of system calls if said first set of system calls meets one or more predefined criteria. This interception and replacement may then be used to map one set of data references onto another set of data references. This mapping can provide flexible data storage, which is transparent to the software process and operating system.