How do I install on OS on an external hard drive ? Is that possible? :confused:

With XP and Vista you can install to any drive on the system. However, you might have problems booting from that drive, especially on a different PC. Why do you want to do this?

How do I install on OS on an external hard drive ? Is that possible? :confused:
Thanks for the reply Scott. I was always wondering if it was possible, I like experimenting you see. You mentioned one con but what are the pros and any other cons?

I really can't think of any pros. The only reasons I can see to do it is to a) have a backup you can immediately boot to or b) have a drive you can boot from that works on multiple PCs.

For the former I would do it differently by using Acronis True Image or Norton Ghost to create a clone of your OS partition and use that for restoration. For the latter, it will only work if all the PCs have the same equipment.

Here's some reading material for you:
Portable OS « portable arcade games (http://flashdrivefreak.wordpress.com/tag/portable-os/)