Current hard drives use magnets to write and read binary data. They are hitting a speed block and if computers are to become faster they will require a different and faster data transfer medium.

Researchers from Radboud University Nijmegen in the Netherlands have used laser light to write data to a magnetic hard drive at very high speeds.
The researchers have managed to transfer almost 100 times faster than conventional magnetic transfers.
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Lol in 10 years SSD would have totally replaced the classical HDD