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US. Patent Feb. 4, 2014 US 8,645,581 B2 Sheet 4 0f 4 FIG. 4 ( START ) DETECT THAT REMOVAL BUTTON IS PRESSED “31 0 I RECEIVE EXECUTION INSTRUCTION FOR UNMOUNT PROCESS N820 I UNMOUNT NOTIFICATION $30 I UNMOUNT PROCESS ~$40 ANNUNCIATE THAT EXECUTION OF UNMOUNT ~S50 PROCESS IS COMPLETED S60 IS EXTERNAL DEVICE REMOVED? MOUNT PROCESS END