1. A human-portable data processing device comprising: one or more data processors that perform operations in accordance with machine-readable instructions; the operations comprising: classifying incoming read commands according to a section of a file system in which the data requested by the incoming read commands would have been found were the file system used at the human-portable data processing device; generating, in response to the incoming read commands, emulation data that emulates data which would have been found in the section of the file system; and responding to the incoming read command with a response that includes the emulation data; a storage medium; and a bus controller configured to output a response to a first incoming read command that specifies a first memory address from which responsive data is to be read with data read from an address in the storage medium, and to output a response to a second incoming read command that specifies a second memory address from which responsive data is to be read with data read from the address in the storage medium, wherein the first memory address specified in the first incoming read command differs from the second memory address specified in the second incoming read command.