Ultra Notebooks (thin notebooks) and Slate devices ship without Optical (CD/DVD) Drives. This makes it more challenging to install a new OS from scratch onto one of these devices. Using a larger capacity USB device you can create a Bootable Utility USB Flash Device (UFB). MSDN explains how to do this in these articles:

1. Gather Required Files for a Bootable Utility Disk

2. Gather Optional Files for a Bootable Utility Disk

3. Create a Bootable Utility UFD