Which device uses a magnetic read/write head to store data?

The device that uses a magnetic read/write head to store data is the hard drive. Hard drives are based on magnetic storage technology, where data is written to and read from spinning disks coated with magnetic material. The read/write head moves across the surface of these disks to access the data.

Magnetic tapes also utilize magnetic technology, but they do not have a traditional magnetic read/write head in the same way that hard drives do. Instead, they operate using a different mechanism suited for sequential data access. USB sticks, which are flash storage devices, use NAND-type flash memory to store data electronically rather than magnetically. Optical disks, such as CDs and DVDs, rely on laser technology to read and write data, differing fundamentally from magnetic storage methods.

In summary, the hard drive is the device designed explicitly for magnetic data storage utilizing a magnetic read/write head for data writing and retrieval.