Creating OS image on USB

Today's fun is to use SCCM to create a USB drive with Windows 7 image installed.

The existing USB has become corrupt so I want to copy an image to it. I already have the task sequence so should be a piece of cake.

http://blogs.technet.com/b/configurationmgr/archive/2011/05/05/how-to-create-offline-or-standalone-usb-media-for-os-deployment-in-configmgr-2007.aspx

First obstacle is the USB is not recognised, so am assuming I have to format it first. But what as? Going for FAT as my first attempt. Worked and now SCCM can see it.

Using both distribution points.

Task sequence media information
Media type: USB flash drive
USB drive: E:\
Protect media with password: Yes
Task sequence: LSA00059-Install Dell 755 Win7SP1 Ent x86+Apps V3 8/9/11
Distribution point(s): SLSASCCM01


Didn't work- missing operating system message.
So now make USB active

http://www.techrepublic.com/blog/window-on-windows/configure-a-usb-flash-drive-to-be-a-windows-7-installation-platform/1446

run DiskPart from cmd line
list disk to get disk number
Select Disk X
clean
create partition primary
active
Format fs=FAT32 quick
assign

USB is now ready to accept image from sccm