Emulating a peripheral mass storage device with a portable device

A human-portable data processing device comprising:

• a writeable storage medium;
• one or more data processors that perform operations in accordance with machine-readable instructions;
• an emulation data generation component connected to respond to classification of an incoming read command to generate emulation data emulating that which would have been read by the incoming read command were the human-portable data processing device a mass storage device, wherein the emulation data generation component comprises a population component configured to populate the writeable storage medium with the emulation data and
• a bus controller configured to perform operations, the operations comprising:
• classifying an incoming read command according to a section of a file system in which the data requested by the incoming read command would have been found were the file system used at the human-portable data processing device;
• and
• responding to the incoming read command with a response that includes the emulation data,
• wherein the bus controller is configured to respond to at least two different incoming read commands specifying different addresses from which the data is to be read with emulation data drawn from a single address of the writeable storage medium.

A human-portable data processing device comprising:

• an emulation data generation component connected to respond to classification of an incoming read command to generate emulation data emulating that which would have been read by the incoming read command were the human-portable data processing device a mass storage device;
• and
• a bus controller configured to
• classify 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;
• and
• respond to the incoming read command with a response that includes the emulation data,
• wherein the bus controller is configured to respond 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
• respond 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.