mkfatImage：linux 中制作fat 文件分区镜像的工具，通过linux loop 设备完成，同时也是学习linux下shell 命令调用的好范例-mkfatImage: wrap the busybox command to create fat partition image

scr ipt to create a partition

创建UD分区，创建启动U盘，是时空论坛beans大神所编写的开源工具(Create UD partition, create a bootable U disk, is beans prepared by the God of space-time forum open source tools)