Storage applications, by their very nature, need an expansion hardware to consolidate more hard drives to a controller. Typically the expansion hardware is designed as an independent printed circuit board and connect to the hard drive backplane in the opposite side of hard drives. When the system is installed in the rack, it requires users to move the whole system box from the position in order to open the lid. It also requires users to power off the system before disconnect the expansion board from the hard drive backplane.
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Chen, Jui Lin and Liu, Chia-Yuan, "A fool proof carrier design for front access storage expansion board", Technical Disclosure Commons, (February 22, 2018)