Data is written and read by a fast-moving head, similar to the way vinyl record albums work. The direction of the magnetization represents the individual bits. HDDs: In an HDD, an enclosure contains a series of platters covered by a ferromagnetic coating. While SSDs and HDDs are both storage devices, the way they work is quite different. The laptop on the left above comes with a traditional hard disk drive, while the one on the right has a more modern solid state drive. Today, when you buy a new PC, you have two very different options: you can get one with an SSD or one with an HDD. ![]() Until the late 2000s, when you bought a new hard disk drive or personal computer, your hard disk storage choices were limited to size and speed - perhaps 5,400 or 7,200 rotations per minute. If price isn’t an issue, SSDs are a better option - especially since modern SSDs are just about as reliable as HDDs. HDDs use mechanical spinning disks and a moving read/write head to access data, while SSDs use memory chips. ![]() The main difference between a solid state drive (SSD) and a hard disk drive (HDD) is how data is stored and accessed.
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