You really should do some googling about memristors and understand them and their applications. "a memristor" is a device, like a memory cell. One memory cell can't make a hard drive. We already have SSDs using proven NAND Flash memory technology. Some experts still claim memristors don't exist. This is from 2020
"Do Memristors Exist Yet?
This is a difficult question to ask, and you will get different answers depending on whom you ask whether memristors exist or not. Devices that behave like memristors do exist, but these are active components. This means that they incorporate an amplifier (i.e. a transistor), to exhibit their property, while a true memristor would be a passive device (i.e. require no external power to operate). Thus, whenever reports come out of practical memristors being used, it is more than likely an active memristor or a passive memristor which exhibits limitations. "