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| Floppy Disk drive having a drive lever for driving a disk |
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Data storage device
| Details |
Inventors: Matsumoto, Hiroshi; Hirao, Mihoko;
Assignee: Nidec Corporation (Kyoto, JP)
Primary Examiner: Korzuch; William R.
Assistant Examiner: Altman; Franklin D.
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, LLP
Provided are novel data storage devices, such as hard disk apparatuses. The devices include a clean chamber accommodating a component formed from a free cutting stainless steel. The free cutting stainless steel has a sulfur (S) content of not less than 0.25 percent by mass and a manganese-to-sulfur content ratio (Mn/S) of not greater than 1.8. The free cutting stainless steel has been subjected to: (1) an acid cleaning; (2) to a passivation treatment; (3) to a degreasing treatment and to a subsequent rust-removing, descaling chemical treatment; or (5) to a degreasing treatment and to a subsequent chromate treatment. |
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DETAILED DESCRIPTION In accordance with one aspect of the present invention, provided is a hard disk apparatus.
The apparatus comprises a clean chamber accommodating a hard disk driven by a spindle motor, and a magnetic head capable of making access to the hard disk.
A free cutting stainless steel is used as the material of a member accommodated in the clean chamber.
The free cutting stainless steel has a sulfur (S) content of not less than 0.
25 percent by mass and a manganese-to-sulfur content ratio (Mn/S) of not greater than 1.
8.
The free cutting stainless steel has been subjected to an acid cleaning.
Preferably, the acid cleaning is conducted with an aqueous solution of an acid capable of removing contaminants, rust and scale remaining on the surface of the free cutting stainless steel.
The acid cleaning is preferably conducted with a solution of nitric acid.
More preferably, the free cutting stainless steel after the acid cleaning is subjected to a neutralizing treatment and further to a chromate treatment.
In accordance with a further aspect of the invention, a hard disk apparatus is provided which comprises a clean chamber accommodating a hard disk driven by a spindle motor, and a magnetic head capable of making access to the hard disk.
A free cutting stainless steel is used as the material of a member accommodated in the clean chamber.
The free cutting stainless steel has a sulfur (S) content of not less than 0.
25 percent by mass and a manganese-to-sulfur content ratio (Mn/S) of not greater than 1.
8.
The free cutting stainless steel has been subjected to a passivation treatment.
Preferably, the passivation treatment is conducted with a treating solution which is nitric acid alone.
Alternatively, the passivation treatment can be conducted with a treating solution which a mixture of nitric acid and sodium bichromate, followed by an alkali neutralizing treatment.
The alkali neutralizing treatment is preferably followed by a chromate treatment.
It is also preferred that the stainless steel be heat-treated to a temperature of from about 100
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