usb pen not bootable

if  you cant create a bootable pendrive try this before change (from MACRIUM reflect guide"

1. Run a command prompt session as an elevated user (see this article for more help) and enter the folloing commands.

2. diskpart

3. list disk

4. Identify the disk number of your USB pen drive. Caution should be taken with this step as incorrectly identifying a drive may attract unwanted consequences further in this solution.

5. select disk , where is the number of the disk previously identified as being the USB pen drive.  In the screenshot above, it can easily be seen that disk number 6 is the one we are after. Confirm that the current disk selection is correct by typing in detail disk, this will show information relating to the currently selected disk.

Please be certain you have the disk selection correct before proceeding to the next step.

6. clean.  This will erase all data on the USB pen drive.

7. create par primary.  This will create a primary partition on the USB pen drive using the maximum size available.

8. active to make the primary partition active.

9. format FS=fat32 LABEL="Macrium WinPE" QUICK.  This will format the newly created partition on the USB pen drive.

10. exit to exit diskpart.

11. exit to close the command prompt session.