A base plate and hard disk drive having the base including a head stack assembly installation portion on which a head stack assembly carried by a shipping comb having a middle support portion is rotatably installed; and a step portion formed on a surface of the base plate to restrict rotation of the shipping comb by hooking the middle support portion of the shipping comb when the head stack assembly installed on the head stack assembly installation portion is rotated with the shipping comb coupled to the head stack assembly.