HDD tray and HDD rack assembly

A HDD rack assembly, adapted to carry a HDD and comprising:

• a HDD rack, comprising:
• a rack body;
• a plurality of fixing structures, disposed on the rack body to form a track, at least one of the fixing structures comprising a first stopper;
• and
• a connector, disposed on the rack body and located at an end of the track;
• and
• a HDD tray, detachably disposed on the fixing structures along the tracks and comprising
• a base, comprising a bottom plate and two base lateral plates connected to the bottom plate;
• and
• a cover, pivoted to the base and comprising a top plate and two cover lateral plates connected to the top plate, wherein at least one of the cover lateral plates comprises a first arcuate edge corresponding to the first stopper, one of each of the cover lateral plates and a corresponding base lateral plate of the base lateral plates comprises a first fixing member which is retractable, the other one comprises a fixing hole corresponding to the first fixing member, each of the first fixing members comprises an outer shell with a concave hole, an elastic member located in the concave hole, a bead connected to the elastic member, and a portion of the bead normally protrudes from the concave hole and is adapted to be retracted into the concave hole when compressed,
• the HDD is adapted to be located between the base and the cover, when the HDD tray is located on the track of the HDD rack, and the cover covers the base, the first arcuate edge of the at least one of the cover lateral plates is located next to the first stopper of the at least one of the fixing structures, the first fixing members extend into the corresponding fixing holes to fix a relative location of the cover and the base,
• when the HDD is located on the track of the HDD rack, and the cover is pivoted upward relative to the base, the first arcuate edge of the at least one of the cover lateral plates pushes against the first stopper of the at least one of the fixing structures when the cover rotates, such that the base is moved away from the connector, and each of the first fixing members is drawn back along an inner wall of the fixing hole, so as to exit the corresponding fixing hole.