One of the big changes ushered in by Apple with OS X Lion was the form of delivery. Since Lion was initially only available as a digital download, users no longer had a physical disc if they wanted to do a reinstall of the OS. Although Lion does automatically create a recovery partition on your hard drive during installation, this isn’t much help if the reason you want to do a reinstall in the first place is because the hard drive itself has failed. Apple has now provided a simple solution that lets Lion users create their own recovery disk – or rather, recovery USB drive.
Read the full article: Apple’s Lion Recovery Disk Assistant makes creating your own OS X Lion recovery drive easy