A system and method for of prioritizing accumulation of time-dependent data is disclosed. The memory card emulates a disk drive for booting purposes, so the BIOS need not be modified to incorporate chain booting. When the collar is on one position, the legs deploy outward from the main body to the extent permitted by the struts, thereby allowing the legs to support the collapsible device upright. The command requests a particular task to be performed. When the subsequent detecting value is greater than the sum of the initial detecting value and the compensation value, the distance between an obstacle and the ultrasonic sensor of the car is compared with the threshold distance. In this native USB or FireWire physical storage device, the USB or FireWire connector is integrated into the storage device control unit.