Install win7 with a mobile hard disk

Install win7 with a mobile hard drive (ultra-simple)
 
Preparation: A mobile hard drive, a downloaded win7 iso, a current system (xp or pe), decompression software or virtual Optical Drive Software
Operation:
1. Clear a partition of the mobile hard disk, format it as the primary partition, and set it as activity (I use H disk as the installation disk for my mobile hard disk)

2. Decompress or use a virtual optical drive to extract all the files in the ISO file to the specified zone under the current system (assumed as X disk)
I use the same 7z decompression software.

3. "Start-run-input cmd" in the current system

4. Run the command in the dos window.
"X: (enter disk x, which is the disk you formatted in front)
Cd boot (enter the boot directory)
Bootsect.exe/nt60 x: (enable the disk to be started. You can see the prompt that it is successful)

 
5. restart the computer to enter the bios and set the mobile hard disk as the first boot device (different displays on the motherboard, but basically USB-xxx)
6. Save the bios settings and restart automatically. You can start and install the device from the mobile hard disk.
7. Install win7. The first step is to extract the file and restart it. During the restart, enter the bios settings and go back to the hard disk for boot (do not start the system from mobile devices)
8. The installation will continue after the restart, and the installation will be successful.
The bold command above is very important. Whether a mobile hard disk can be started as a boot disk depends on it.