Noncontact communication medium, magnetic tape cartridge, method for operating noncontact communication medium, and program

A noncontact communication medium, comprising:

• a processor;
• and
• a memory incorporated in or connected to the processor,
• wherein the noncontact communication medium performs noncontact communication with an external communication device,
• wherein the memory has a storage block where information regarding an attribute of the noncontact communication medium is stored and that includes a plurality of storage fields,
• wherein the plurality of storage fields include a specification-independent storage field where information independent of a specification of a magnetic tape cartridge, in which the noncontact communication medium is mounted, is stored,
• wherein the processor is configured to:
• write accompanying information regarding the magnetic tape cartridge in the specification-independent storage field in response to an instruction given from the external communication device to the noncontact communication medium by the noncontact communication, and
• lock an area in the storage block where a write-in is performed, in a basic information amount unit, and
• wherein the basic information amount unit is a byte unit.

A noncontact communication medium, comprising:

• a processor;
• and
• a memory incorporated in or connected to the processor,
• wherein the noncontact communication medium performs noncontact communication with an external communication device,
• wherein the memory has a storage block where information regarding an attribute of the noncontact communication medium is stored and that includes a plurality of storage fields,
• wherein the plurality of storage fields include a specification-independent storage field where information independent of a specification of a magnetic tape cartridge, in which the noncontact communication medium is mounted, is stored,
• wherein the processor is configured to write accompanying information regarding the magnetic tape cartridge in the specification-independent storage field in response to an instruction given from the external communication device to the noncontact communication medium by the noncontact communication, and
• wherein the specification-independent storage field has a type-dependent storage field where information dependent on a type of the noncontact communication medium is stored, and a type-independent storage field where information independent of the type is stored, and
• the processor is configured to write the accompanying information only in the type-independent storage field.

A method for operating a noncontact communication medium that includes a memory incorporated in or connected to a processor and performs noncontact communication with an external communication device,

• in which the memory has a storage block where information regarding an attribute of the noncontact communication medium is stored and that includes a plurality of storage fields, and
• the plurality of storage fields include a specification-independent storage field where information independent of a specification of a magnetic tape cartridge, in which the noncontact communication medium is mounted, is stored,
• the method comprising:
• writing accompanying information regarding the magnetic tape cartridge in the specification-independent storage field in response to an instruction given from the external communication device to the noncontact communication medium by the noncontact communication,
• locking an area in the storage block where a write-in is performed, in a basic information amount unit, and
• changing the basic information amount unit to limitless in a case where a flag indicating limitation to change of the basic information amount unit is not set.

A non-transitory computer-readable storage medium storing a program executable by a computer, which is applied to a noncontact communication medium that includes a memory incorporated in or connected to a processor and performs noncontact communication with an external communication device, to perform a process,

• in which the memory has a storage block where information regarding an attribute of the noncontact communication medium is stored and that includes a plurality of storage fields, and
• the plurality of storage fields include a specification-independent storage field where information independent of a specification of a magnetic tape cartridge, in which the noncontact communication medium is mounted, is stored,
• the process comprising:
• writing accompanying information regarding the magnetic tape cartridge in the specification-independent storage field in response to an instruction given from the external communication device to the noncontact communication medium by the noncontact communication,
• locking an area in the storage block where a write-in is performed, in a basic information amount unit, and
• changing the basic information amount unit to limitless in a case where a flag indicating limitation to change of the basic information amount unit is not set.