I was working today on making my memory stick bootable so I could role out new images to the computers in the remote branches where I don’t have deployment servers. I did some searching and came across these instructions which are better than the instructions I posted couple of months back on making a USB stick bootable. I had tried them but must have missed a step cause it didn’t work for me. (I think I forgot to set the attributes for +S on bootmgr). Today I found these instructions, which did work. At the command prompt do the following

diskpart

select disk 1

clean

create partition primary

select partition 1

active

format fs=fat32

assign

exit

Note:The value of disk 1 is equal to the UFD’s disk ID. 
Ensure that you are using the correct disk ID.

Once you completed that, go to your Media deployment point. This is important, you need to create a deployment point for removable media and then update the files so it populates the share. It will then create a content folder so copy the contents of that folder to the root of the USB stick and make the bootmgr file on the USB stick a system file and you’ll be off to the races.

Remember to get your hands on a fast USB stick, as I followed these instructions on a slow USB stick and it ended up taking 15 minutes to put 1.5gb on the stick and it was taking a long time to boot into PE. I was called out so I had to give up for the time being but I will be getting a faster and a few more USB stick to handle the roll out in the smaller branches.