Je me note ca ici car ca vient de me servir:
> diskpart
> list disk
> select disk 1
> list disk # Check the wildcard in front of the disk name
> clean
> create partition primary
> active
> format fs [ntfs|fat32|exfat] label "name" quick
> assign

via http://orangina-rouge.org/shaarli/?gHl0NQ
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