You can not format DVD-R disks, These are once only write disks, can't be written / erased again.
For your need, you need to buy DVD+RW or DVD-RW disks.
How to format a DVD-R disc in Windows 10?
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Anonymous
How to format a DVD-R disk in Windows 10?
Windows for home | Windows 10 | Devices and drivers
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Sumit D - IA 167K Reputation points Independent Advisor2018-12-06T03:48:32+00:00 Hi,
By design, R disks cannot be formatted-he "R" format DVDs can be written once and read arbitrarily many times
Do you have an RW aka rewritable disk?