How to make pen drive bootable?

Introduction:-
Now a days many operating system are coming into market of linux. but because of the cost of original cd people usually download it from net and write it into cd and then run it. for testing an operating sysytem wasting the cd is not good task as well.So for testing there is a simple way to do it, and that way is making your pen drive bootable and installing OS into it,
Now the question arises that our pen drive is not a bootable device but we can make it bootable by creating track and sector on it by using software
Steps:-

• Firstly format your pen drive into disired format which os require for example dos require fat 16 and all the newer versions support fat32 and ntfs.
  

Note:- windows in build utility does not provide you fat16 and many more formatting option so you have to do it using other utility search on google for required format.

• Now create bootsector into your pen drive using the software
  

a) syslinux utility(command line e.g in cmd)

type "\syslinux.exe -m -a -d /boot/syslinux z:" (z=pen drive letter)

or

b) HP Drive Key Boot Utility (graphical).
1) install it into your computer.
2) now start it from start menu.
3) follow the simple steps and tell it to make your pen drive bootable.