Data storage device carrier assembly

A data storage device carrier assembly, comprising:

• a first carrier comprising a pair of parallel side walls configured for mounting large data storage devices therebetween;
• and
• a second carrier comprising a pair of parallel side plates configured for mounting small data storage devices therebetween, a distance between the pair of side plates of the second carrier being less than a distance between the pair of side walls of the first carrier, a bracket attached on one of the side plates of the second carrier to cooperatively form a unit having a width approximately same as the distance between the pair of side walls of the first carrier, the unit being mountable between the side walls of the first carrier;
• wherein one of the side walls of the first carrier defines a sliding groove therein, and one of the side plates of the second carrier forms a protrusion configured to slide in the sliding groove.