earseExternalDiskOnMac.md

Sometimes Mac won't recognize your disk after you did something stupid, you should do:

# This command lists all your disks(internal & external)
$ diskutil list

# The result would be something like: 
# /dev/disk6[this number is important] (external, physical):

# After getting this number, we should do:

# NOT JHFS+ represents the format, you can always set any format you needed here.
$ diskutil eraseDisk JHFS+ [name] /dev/disk[number_you_get_from_last_step]

After this you operating system should be able to recognize your disk without any issue.