Will Microsoft sell Windows 7 on a USB flash drive? Since they are targeting netbooks (which don't have optical drives), it would make sense to offer the installer file on a flash drive. My Lenovo Thinkpad X200 Tablet doesn't have a built-in optical drive. I have an external drive, but I hardly use it. My docking station has an optical drive, but I hardly use that too. So, it would make a lot of sense to have Windows 7 on a USB flash drive.