Hi Anonymous11847,
I'm Rodrigo and I will help you.
Clean the disk on the CMD then, reformat it on the Disk Management.
To clean the disk, on the Start Menu type diskpart and press enter.
a CMD window will open showing diskpart.
Type "list disk" to show all disks available, the disk number matches with the number shown on Disk Management. Type "select disk 1"
The information will show that disk 1 is selected.
Type "clean", this will erase the disk and remove all partitions. Now you cna close the CMD window. Back to Disk Management, the disk will be shown with a black bar instead of the blue one. Right click it > New Simple Volume and follow the steps to format it and assign a letter to it.
In the example below I did it with this disk in my system. It shows as disk 5 on disk management.