Two reputable sources on Windows topics, namely the German web site WinFuture and the famous US journalist Paul Thurrott, have announced that some versions of Windows 10 may appear on USB flash drives instead of on optical disks.
This is very much possible since Microsoft wants Windows 10 to run on all kinds of devices and certain tablets, ultrabooks and notebooks simply lack optical drives. Most likely only people who own such devices and are interested in the new Microsoft OS will be interested in Windows 10 on a USB flash drive.
Apart from this here are the first prices of Windows 10 – Windows 10 Home and Windows 10 Pro will sell for USD 119 and USD 199, respectively. The new OS will become commercially available on July 29 and will sell in more than 190 countries around the world.
Source: WinFuture.de