In my pc Iím working with windows XP but due less security virus attacked in my pc. Due to this my pc is not working properly itís always get hang. So I decided to format my C drive but this time I want to change my operating system, because I want to become familiar with Linux also. But the problem is quite serious that my CD-Rom is not working properly so I how boot my pc. So friend I have decided that to boot my pc with the help of hard drive because in my external hard drive I have kept a copy of red hat Linux. So friend it is possible to boot pc with help of hard drive instead of CD-ROM.