US Patent 8081445 Drainage structure and information processing unit

A drainage structure of the present invention includes a drainage groove, a drain, and a groove portion. Thus, even in the case where a user accidentally spills a liquid such as water on an upper face of a first housing, intrusion of the liquid into a disk drive can be prevented, and damage to the disk drive can be prevented. Moreover, the drain is connected to the groove portion. Thus, a liquid that drains from the drain can be collected in the groove portion. Accordingly, the liquid can be prevented from spreading over a wide area, and adhesion of the liquid to various types of electric components disposed in a back face of the first housing can be prevented.