Method of manufacturing a disk drive having a base member, bearing unit, drive unit and hub

1. A method of manufacturing a disk drive device comprising:

assembling a subassembly by fixing at least a bearing unit, a drive unit and a hub to a base member in a first clean room;

cleaning the subassembly in a second clean room; and

sealing the subassembly by a sealing member,

wherein the first clean room and the second clean room are communicated with each other by a communicating opening for transferring the subassembly, and wherein an atmospheric pressure in the second clean room is equal to or higher than that in the first clean room.

2. The method of claim 1 , further comprising drying the subassembly while heating, between the cleaning and the sealing.

3. The method of claim 1 , further comprising confirming whether the subassembly has a void, between the cleaning and the sealing.

4. The method of claim 1 , further comprising confirming a resistance value of a coil of the drive unit, between the cleaning and the sealing.

5. The method of claim 1 , wherein the cleaning includes cleaning the subassembly by blowing a mixture of purified water and air against the subassembly.

6. The method of claim 1 , wherein, in the cleaning, the subassembly is cleaned while being placed in a cleaning solution.

7. The method of claim 6 , further comprising fixing a removable cover member to a gap between the base member and the hub, before the cleaning.

8. The method of claim 7 , wherein the cover member is made of a resin material.

9. The method of claim 7 , wherein the cover member is an elastic body.

10. The method of claim 8 , wherein, in the fixing in which the cover member is fixed, a liquid resin is applied to the gap between the base member and the hub, and thereafter is cured.

11. The method of claim 10 , wherein the liquid resin is cured by ultraviolet irradiation.

12. The method of claim 6 , wherein, in the cleaning, the subassembly is cleaned by ultrasonic wave irradiation.

13. The method of claim 12 , wherein, in the cleaning, the subassembly is cleaned by irradiating ultrasonic waves having two or more types of frequencies, in the cleaning solution made of purified water.

14. The method of claim 13 , wherein, in the cleaning, a frequency of the ultrasonic wave exerted on the subassembly at a period before the cleaning is ended, is higher than that of the ultrasonic wave exerted thereon at a period when the cleaning is initiated.

15. The method of claim 12 , wherein, the cleaning includes a step in which the subassembly is cleaned by irradiating a ultrasonic wave in the cleaning solution made of alkali ion water.

16. The method of claim 6 , wherein, in the cleaning, the subassembly is cleaned while being conveyed in the cleaning solution, and the cleaning solution is flowing toward the direction opposite to that of the subassembly being conveyed.