Provided herein is an apparatus including a disk drive base, wherein the disk drive base includes a first metal composition with a first CTE (coefficient of thermal expansion). A disk drive cover is attached to the disk drive base, wherein the disk drive cover includes a second metal composition with a second CTE that are different from the first metal composition and the first CTE. An arm is connected to a reader and a writer, wherein the arm is coupled to the disk drive base, the reader and the writer are separated by a distance, and the distance affects an MR (magnetoresistive) offset. In response to temperature changes between 0 C. and 60 C., the first material and the second material expand and contract comparably and proportionally. In further response to the temperature changes between 0 C. and 60 C., a change in the MR offset is less than 10% or a preferably defined range of a track pitch on a recording medium attached to the disk drive base.

A hard disk drive includes a cover coupled to a base deck to create an enclosure. The hard disk drive further includes data-recording components and non-data-recording components positioned within the enclosure. At least one of the non-data-recording components includes a surface with a surface treatment that promotes condensation of water vapor.

A hard disk drive includes a cover coupled to a base deck to create an enclosure. The hard disk drive further includes data-recording components and non-data-recording components positioned within the enclosure. At least one of the non-data-recording components includes a surface with a surface treatment that promotes condensation of water vapor.

A disk device includes a top cover and a disk medium with a recording surface. The top cover includes a center horizontal portion having a surface which extends from a center point of the disk medium along the recording surface to an outer peripheral portion, a curved portion having a surface which extends from the outer peripheral portion of the center horizontal portion in a direction away from the recording surface, and an outer horizontal portion having a surface which extends from the curved portion in a direction away from the center point and along the recording surface. The recording surface includes a first zone in which data is set to be written, and a second zone in which data is set not to be written, the second zone being disposed adjacent to the first zone on an outer edge side of the disk medium from the first zone.

A base plate is a portion of a housing of a hard disk drive, and includes a cast base body. The base body includes an inner surface including an inside machined surface that is machined and an inside non-machined surface that is not machined. The base body includes an outer surface including an outside machined surface that is machined and an outside non-machined surface that is not machined. The outside machined surface and the inside non-machined surface overlap in an axial direction that is a direction parallel or substantially parallel to a rotation axis of a disk of the hard disk drive.

Provided herein is an apparatus including a disk drive base, wherein the disk drive base includes a first metal composition with a first CTE (coefficient of thermal expansion). A disk drive cover is attached to the disk drive base, wherein the disk drive cover includes a second metal composition with a second CTE that are different from the first metal composition and the first CTE. An arm is connected to a reader and a writer, wherein the arm is coupled to the disk drive base, the reader and the writer are separated by a distance, and the distance affects an MR (magnetoresistive) offset. In response to temperature changes between 0 C. and 60 C., the first material and the second material expand and contract comparably and proportionally. In further response to the temperature changes between 0 C. and 60 C., a change in the MR offset is less than 10% or a preferably defined range of a track pitch on a recording medium attached to the disk drive base.

A base plate defines a portion of a housing of a disk drive device. The housing accommodates therein a disk, a spindle motor that rotationally drives the disk about a center axis that extends in a vertical direction, and an access portion that carries out at least one of reading or writing of information with respect to the disk. The base plate includes a cast metal base body and an electrodeposition coating film that covers the surface of the base body. The base body includes a bottom plate portion extending from the center axis to an outward in a radial direction and a wall portion with a rectangular or substantially rectangular shape viewed in the axial direction upward from an outer circumference portion of the bottom plate portion. An outside surface of the wall portion includes a coated surface covered with the electrodeposition coating film, a processing surface which is flat and on which a casting material is exposed from the electrodeposition coating film, and a parting line. The processing surface extends in the axial direction in contact with the parting line or across the parting line.

According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head including a write head which writes data to the magnetic disk, a read head which reads data from the magnetic disk, a first heater which adjusts a flying height of the write head, a second heater which adjusts a flying height of the read head and a controller which controls powers supplied to the first heater and the second heat, and controls a power value of the power supplied to the first heater according to a ratio between an electric resistance value of the first heater and an electric resistance value of the second heater.

A hard disk drive including a base deck with a base member and side walls extending from the base member. The side walls include a non-metallic material and include a structure made from the non-metallic material. The structure is arranged to dampen vibration. The side walls can be formed using an additive manufacturing process.

A casing is configured for a data storage device to be disposed thereon. The casing includes a chassis and an operation member. The chassis includes a front plate, and the front plate has a plurality of assembling slots. Each of the assembling slots has a retaining part and a releasing par. A width of the releasing part is larger than a width of the retaining part. The assembling slots are configured for a plurality of fasteners of the data storage device to be disposed therethrough, and the plurality of fasteners are configured to be slid between the retaining parts and the releasing parts of the assembling slots. The operation member is slidably disposed on the front plate and slidable between a retaining position and a releasing position. When the operation member is in the retaining position, the operation member retains the fasteners at the retaining parts.