不从U盘启动

安装到U盘成功,CMOS里设置从U盘启动,却不从U盘启动,为何?

[winapi] dev=C:(d0p1) offset=63 size=12659157
[winapi] dev=D:(d0p2) offset=12659283 size=63231777
[winapi] dev=E:(d0p3) offset=75891123 size=84935592
[winapi] dev=G:(d1p1) offset=63 size=3948480
[xdio] dev=hda1 offset=63 size=12659157
[xdio] dev=hda2 offset=12659220 size=148167495
[xdio] dev=hda5 offset=12659283 size=63231777
[xdio] dev=hda6 offset=75891123 size=84935592
[xdio] dev=hdb1 offset=63 size=3948480