If you have run FDISK (partitioned the drive?) and then formatted it, you no longer have an operating system. Therefore, if you try to boot from the hard drive, you will get an Invalid System Disk message. You will have to reinstall Windows.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
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