Final answer:
Dynamic RAM (DRAM) is the only memory storage device listed that needs to be constantly recharged to retain its contents, as it uses capacitors that lose charge over time.
Step-by-step explanation:
The memory storage device that needs to be constantly recharged to retain its contents is Dynamic RAM (DRAM). Unlike hard disk drives (HDD), solid-state drives (SSD), and magnetic tape, which retain data without the need for a constant power supply, DRAM uses capacitors and transistors to store each bit of data
However, as capacitors tend to lose charge over time, DRAM must continually refresh its memory cells to maintain the stored data. This process involves recharging the capacitors thousands of times per second to preserve the information. Consequently, DRAM is a volatile form of memory, meaning that it requires power to maintain the stored information.