A storage device includes a hard disk backplane, a first cascading board, and a hard disk array. The hard disk array includes a plurality of hard disks, and is located on a first side of the hard disk backplane. The first cascading board is a field-replaceable unit FRU, and is located on a second side of the hard disk backplane.

A packaging tray for a hard disk drive has a plurality of positioning holes. The packaging tray includes a box body, and the box body has a plurality of frame walls and an accommodating space surrounded by the frame walls. The box body has formed a plurality of positioning posts at a bottom of the accommodating space, and the positioning posts are disposed corresponding to the positioning holes of the hard disk drive. Therefore, the hard disk drive placed in the accommodating space will not contact dust in the box body, and the hard disk drive in the box body can avoid scratching.

One feature pertains to a scissor-based carrier assembly for a mass storage device used in a storage computer system. The carrier assembly has fixed and moving parts allowing the carrier to change from a retracted state to insert or remove the mass storage device into or from a storage enclosure to an extended state to couple the mass storage device with a connector of the storage computer system.

The present disclosure describes a server computer system having a chassis, a carrier, and a pivot member configured to connect the carrier to the chassis. The pivot member further permits the carrier to rotate between a first position with a first carrier end within the chassis, and a second position with the first carrier end extending out of the chassis.

One feature pertains to a scissor-based carrier assembly for a mass storage device used in a storage computer system. The carrier assembly has fixed and moving parts allowing the carrier to change from a retracted state to insert or remove the mass storage device into or from a storage enclosure to an extended state to couple the mass storage device with a connector of the storage computer system.

A method of manufacturing a magnetic disk device of an embodiment includes: adjusting relative heights of a spindle and a plurality of ramps, the spindle being allowed to rotate in a state in which center axes of a plurality of magnetic disks having ends deviating from a geometrical plane with a center point as a reference are aligned, the plurality of ramps being arranged at end positions of the plurality of magnetic disks; and assembling the plurality of magnetic disks along an axial direction of the spindle in a state in which directions of deviations of the ends from the center point are aligned.