| 摘要 |
PROBLEM TO BE SOLVED: To provide an external storage medium, having increased versatility by providing autonomy. SOLUTION: This medium is provided with a controller 72 for using information stored in a storage part 81, performing arithmetic processings about the information and outputting an arithmetic result and a power source 74 for driving the controller. Also, a storage part provided with a storage capacity remaining amount information storage part 79 is included, a storage capacity remaining amount is calculated by a remaining amount calculation program 78, the result is stored in the storage capacity remaining amount storage part and a notifying part for notifying the storage capacity remaining amount to the outside, a display part 77 for instance, is included.
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