创建可启动USB 盘

Step 1: Create  a bootable disk

Since the WIM file I'm creating (see Step 2) will be larger than 4 GB, the USB stick needs to be formatted with NTFS. In a command prompt with administrative rights, do the following ("clean" will permanently erase the contents of your USB key!!):

diskpart
list disk
select disk 1
clean
create partition primary
select partition 1
active
format fs=ntfs quick
assign
exit

The above assumes that the "list disk" command showed you two disks, "Disk 0" being your internal hard disk and "Disk 1" being the USB stick. Your system might be different. "clean" will permanently erase the contents of your USB key!! Ony my system, the "assign" command put my USB key on drive H:, this could also be different on yours.

Next, copy the contents for example of a Vista Windows 7 (*) CD to your USB key:

the source PE file, like use a 7-zip to extract the original ISO file.

xcopy f:\*.* /s /e /f h:\

Your USB key is now ready to go.
(*) = I found Windows 7 to work best for me. Just use Beta 1 or, when available, RC.

http://blogs.technet.com/b/ferminsa/archive/2009/03/26/how-to-create-the-ultimate-usb-multi-boot-disk.aspx