delete all old files about usb_acc, use new files download from post #1241 (read .txt document in it).
update your grub4dos to grub4dos-0.4.5b-2011-03-26.7z or above.
put the GRUB.EXE together with USB_ACC.0PE, USB_ACC.DOS.
谢谢pesudo大的解答,我用的是移动硬盘启动,不能交换,但是初期安装能完成,重启后选择映射iso后从硬盘启动菜单,是从移动硬盘启动的,不能从目标硬盘启动,切换到命令行map (hd0) (hd1)能成功,但是接下来map (hd1) (hd0)就出现Error 21: Selected disk does not exist
不知道是啥原因?