How to use Windows and mobile hard disk to install windows 7

There are n ways to install a new Windows system, here, n >= 5. Hard disk installation, CD installation, U disk installation, virtual CD-ROM installation, Ghost installation and so on. Today, I would like to say a few words to the novice friends about the benefits of installing Win7 with a USB flash drive or a mobile hard disk.
Installation speed is fast Normal CD-ROM installation can be done in 20-35 minutes, but it is faster to install Windows7 with USB mobile hard disk, generally no more than 10 minutes. Of course, the U disk can also be done, but the U disk is too slow to copy small files.
It is convenient to adjust the partition size of the built-in hard disk of the computer. The advantage of installing Windows7 with an external device is that you can freely partition the hard disk in the computer. Of course, you can also use the CD-ROM installation. The comparison here is to use the virtual CD-ROM or hard disk installation method. .
How to install Windows with USB mobile hard disk or U disk? 1. Under Vista or Win7, enter Control Panel - Administrative Tools - Computer Management - Disk Management, right click on the partition of usb mobile hard disk, click "ld" ; Mark the partition as the active partition”.
2. Copy all the files and folders in the Windows 7 installation disk (or the iso file directly, or use the virtual CD-ROM drive) directly to the usb mobile hard disk.
3, can boot the usb hard disk installation disk is completed, set up in the bios usb hard disk boot, directly start the installation program, it is so simple.
4, no need for third party software, no need to engrave. The principle is very simple, the first step is to write the startup information. Activate the partition under Vista/Win7, then write bootmgr, if you activate the partition under xp, it is written to ntldr.