format c: /u
If you want an unconditional format
format c: /q
If you want a quick format - which just clears the disk without rewriting anything.
To format the C drive, you will need to run this from a floppy disk.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.