By read-write speed, U-disk carrying out USB interface criterion enjoys popularity, speed of which is much higher than floppy disk.
从读写速度来说，U盘采用USB接口标准广受欢迎，读写速度比软盘快的多。
SL811HST chip is used as USB host which can read and write flash disk, thereby a kind of adscititious mass storage is accomplished .
通过采用SL811HST芯片，实现了USB主机的功能，可读写U盘，从而实现了单片机的外挂式海量存储。
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