Abstract: An apparatus and method for guiding bypass reentry flow through contraction and filter in a hard disk drive. The method provides a bypass channel for directing airflow away from a first portion of a disk of the hard disk drive and toward a second portion of the disk of the hard disk drive. A contraction portion is coupled with the bypass channel at a location wherein the bypass channel directs the airflow back toward the second portion of the disk of the hard disk drive. The contraction portion accelerates a first portion of the airflow directed toward the second portion of the disk of the hard disk drive. A filter portion integral with the contraction portion is utilized for filtering a second portion of the airflow directed toward the second portion of the disk of the hard disk drive.

Abstract: A sealed head disk assembly having a base casting that provides attachment points for the major components of the head disk assembly and a cover for enclosing the major components of the head disk assembly. The base casting has a hermetic seal encompassing an outer perimeter of the base casting. The hermetic seal is juxtaposed to at least one complementary surface on the cover. The cover has a semi-hermetic seal inside a perimeter of the complementary surface for the hermetic seal. The semi-hermetic seal is juxtaposed to at least one complementary surface on the base casting.

Abstract: A sealed head disk assembly has a base casting for providing attachment points for the major components of the head disk assembly. The base casting has a semi-hermetic seal encompassing an outer perimeter of the base casting and allows the semi-hermetic seal to be juxtaposed to at least one complementary surface on the cover. The cover for enclosing the major components of the head disk assembly has a hermetic seal outside a perimeter of the complementary surface for the semi-hermetic seal thus allowing the hermetic seal to be juxtaposed to at least one complementary surface on the base casting.

Abstract: A sealed head disk assembly has a base casting for providing attachment points for the major components of the head disk assembly. The base casting has a hermetic seal encompassing an outer perimeter of the base casting and a semi-hermetic seal inside a perimeter of the hermetic seal, thus allowing the hermetic seal and the semi-hermetic seal to be juxtaposed to at least one complementary surface on a cover. The cover for enclosing the major components of the head disk assembly has at least one complementary surface.

Abstract: A sealed head disk assembly has a cover for enclosing major components of the head disk assembly. The cover has a hermetic seal encompassing an outer perimeter of the cover and a semi-hermetic seal inside a perimeter of the hermetic seal. The hermetic seal and semi-hermetic seal are juxtaposed to at least one complementary surface on the base casting. The base casting, which provides attachment points for the major components of the head disk assembly has at least one complementary surface.

Abstract: A device streamlines air flow inside a hard disk drive with a stationary afterbody that is located adjacent to each of the disks. A diverter portion of the device enhances the volumetric flow of air through a diffuser and a contraction. The overall function of the device effectively expands the air flow so that the speed of the air flow gradually decreases while pressure increases. This design reduces losses in system momentum due to sudden expansion of the air in the drive. In addition, air flow moving toward the disk pack may be contracted to allow efficient energy conversion from pressure energy to kinetic energy prior to merging of the bypass air flow with the air flow among the disks.

Abstract: An apparatus and method for guiding bypass reentry flow through contraction and filter in a hard disk drive. The method provides a bypass channel for directing airflow away from a first portion of a disk of the hard disk drive and toward a second portion of the disk of the hard disk drive. A contraction portion is coupled with the bypass channel at a location wherein the bypass channel directs the airflow back toward the second portion of the disk of the hard disk drive. The contraction portion accelerates a first portion of the airflow directed toward the second portion of the disk of the hard disk drive. A filter portion integral with the contraction portion is utilized for filtering a second portion of the airflow directed toward the second portion of the disk of the hard disk drive.

Abstract: A top pole piece of a voice coil motor (VCM) is attached to a hard disk drive cover without screw fasteners and with minimal loss of VCM magnetic flux capacity. A pair of leaf springs are supported at both ends, rather than by cantilever, to more uniformly distribute mechanical stress throughout the springs so that less space is required to achieve the same transverse load as a cantilevered spring of the same profile. The smaller space envelope required by this design minimizes the loss of magnetic flux capacity of the VCM. Each leaf spring has two integral legs, central portions of which are rigidly fastened to the drive cover. The end of each leg opposite the central portion applies a force against the cover in the assembled disk drive.

Abstract: A device streamlines air flow inside a hard disk drive with a stationary afterbody that is located adjacent to each of the disks. A diverter portion of the device enhances the volumetric flow of air through the diffuser. The overall function of the device effectively expands the air flow so that the speed of the air flow gradually decreases while pressure increases. This design reduces losses in system momentum due to sudden expansion of the air in the drive. In addition, air flow moving toward the disk pack may be contracted to allow efficient energy conversion from pressure energy to kinetic energy prior to merging of the bypass air flow with the air flow among the disks.