Connect the hard drive physically and then boot and do
fdisk -l
and see if it show up, for instance /dev/hdc, then do
fdisk /dev/hdc
and create a partition or more there, ex.: /dev/hdc1, then do
mke2fs /dev/hdc1 (without mounting it) or whichever fs you want.
then create a mount point for it:
mkdir /mnt/hdc1
then
mount -t ext2 /dev/hdc1 /mnt/hdc1
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