First, we’ll cover the USB media tools that you are using to create Windows installation media, not just for the 10 TP, but for 7, 8 and 8.1.
Rufus is “a utility that helps format and create bootable USB flash drives, such as USB keys/pendrives, memory sticks, etc” and it especially useful in case where “you need to create USB installation media from bootable ISOs (Windows, Linux, UEFI, etc.)”
Download Rufus. From here on in, we will assume that you already have one, or both of the Windows 10 Technical Previews already downloaded. Again, this is all being done from a Windows 8.1 Pro client machine.
1.Download Rufus and run the application.
There might be a case for right clicking and choosing Run as administrator, so keep that in mind
2. From the screenshot below, you will see the settings we’ve used to format the disk
3.Please ensure you choose the correct Device from the ones available
4.Click the disc/drive image beside the ISO Image dropdown to load your downloaded ISO
This ISO will change the New volume label
5. As detailed by you, our readers, in about 15 minutes I had a fully working and bootable Windows 10 USB install media
Click Start and wait for the process to complete