BOIS启动里removable dev能不能作为U盘启动
  可以。先下载一个winpe的ghost镜像，将它ghost到U盘内，bios里面选择first boot dev 为removable dev，将U盘插在USB口上（这部很重要），重启的时候不要拔下来，到自检画面按提示进入选择U盘为启动设备（部分机器还是要进入bios选择，都一样）。这样U盘就可启动了。    Removable Dev包含usb 设备，但并不意味着就是USB设备，还包括其他的移动设备，如果启动项设置界面有USB HDD ，就是从移动硬盘或U盘启动；如果有USB ZIP ，就需要把U盘做成ZIP启动盘；上面的方法适合用大容量U盘制作，小容量硬盘可以做个dos的启动盘，个人觉得pe比较好用。

                                             AMI BIOS 8.0设置疑难解答                                                                                                                                                                                   1st boot device第一启动顺序                                                                                                                                                                                                                            2st boot device第二启动顺序                                                                                                                                                                                                                            3st boot device第三启动顺序 
Diskette Drive 软盘驱动器
Internal HDD 内置硬盘驱动器
Floppy device 软驱设备
Hard-Disk Drive 硬盘驱动器
USB Storage Device USB存储设备
CD/DVD/CD-RW Drive 光驱
CD-ROM device 光驱
Removable为移动装置.                                                                                                                                                                                                                                  onboard lan boot rom(板载网络启动选项)。Disableed为禁止