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    • 1. 发明授权
    • USB flash drive and method for determining available storage capacity of the USB flash drive
    • USB闪存驱动器和确定USB闪存驱动器的可用存储容量的方法
    • US08274398B2
    • 2012-09-25
    • US12730258
    • 2010-03-24
    • Le Zhang
    • Le Zhang
    • G08B5/00G08B5/24
    • G07C3/045
    • A Universal Serial Bus (USB) flash drive includes an USB interface, a control unit, a storage unit, a timer, a logic circuit, and a quartz meter that includes a scale dial and a dial pointer. The control unit calculates a storage capacity difference between a current storage capacity and a previous storage capacity, and calculates a runtime of the dial pointer according to a time calculation algorithm. The control unit generates an enabling signal if the storage capacity difference is not equal to zero, and generates an interrupt signal when the runtime equals the time value. The logic circuit outputs a high voltage to the quartz meter to control the dial pointer to run around the scale dial according to the enabling signal, and outputs a low voltage to the quartz meter to control the dial pointer to stop running around the scale dial according to the interrupt signal.
    • 通用串行总线(USB)闪存驱动器包括USB接口,控制单元,存储单元,定时器,逻辑电路和包括刻度盘和刻度盘指针的石英计。 控制单元计算当前存储容量与先前存储容量之间的存储容量差,并根据时间计算算法计算刻度盘指针的运行时间。 如果存储容量差不等于零,则控制单元产生使能信号,并且当运行时间等于时间值时产生中断信号。 逻辑电路向石英仪表输出高电压,根据启用信号控制刻度盘指针绕规模拨盘运行,并向石英仪表输出低电压,以控制刻度盘指针停止在刻度盘上运行 到中断信号。