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.
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This 2D animation about monsters is illustrated in a Van Gogh painterly style
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.