What the hard drive industry is doing is irrelevant. The hard drive industry could all go bankrupt and that wouldn't directly matter because the hard drive read head is not a needed component for making MRAM; it is merely a product that uses a similar concept. Both my car and a little RC helicopter drone use motors and have batteries, but either car or RC helicopter industries could go out of business without harming the other.MRAM comes in many flavors, but Everspin uses Spin-Torque (ST-MRAM) technology. MRAM stores data magnetically, which is in stark contrast to electron-based data storage techniques. MRAM retains all stored data when the device loses power (which means it is a persistent non-volatile storage medium). A perpendicular magnetic tunnel junction (pMJT), which HDD vendors use in read heads, serves as the memory cell. It uses standard CMOS transistors. The design consists of two ferromagnetic plates with an insulating dielectric layer between them. One plate is set to a known polarity (fixed layer), and the other plate's polarity can be changed (free layer). If both plates have matching polarity, the cell will be in a low-resistance state (1), and if they have different polarity, the cell will be in a high-resistance state (0). The device measures the resulting electrical resistance to determine if the cell holds a "1" or "0." The cell does not have to be erased before it is rewritten, which simplifies management and increases performance.