| 摘要 |
A portable storage device comprises a nonvolatile memory, a nonvolatile memory area, an indicator, and a controller. When machine-readable data stored in the nonvolatile memory is altered, the controller automatically calculates utilization information of the nonvolatile memory and stores the same in the nonvolatile memory area. The indicator is coupled to the nonvolatile memory, nonvolatile memory area, and the controller and displays the utilization information accordingly.
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