You couldn’t run a format command when within the disk you were trying to format. You’d need to (for example) cd A: and then format c:.

Deltree, on the other hand…

foobarian 4 hours ago | parent | next [-]

There was a secret option at one point 'FORMAT C: /AUTOTEST'

stuaxo 4 hours ago | parent | prev [-]

The favourite of naughty kids in computer shops with Windows 95

	▲	qubex 4 hours ago \| parent [-]
		Yup.