if you get 'command not found', you're likely not running as root (fdisk is a command in /sbin). Moreover though, fdisk is not likely what you want. fdisk is a partioner, and thus fdiscking a single partion (rather than plain ole sda) will not get you the desired results. Instead, you want to use mkfs.[YOURDESIREDFS] /dev/sda[PARTITION NUMBER]
fdisck the drive first to get the partitions the way you want, and then use mkfs format it with the desired fs.
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