There are three major types of storage devices used in computers. They are Serial ATA (SATA), Solid State Drive (SSD) and Hard Disk Drive (HDD). Although each one functions differently, they all store data. Let’s take a look at the differences between these storage devices.
Serial ATA hard drives connect to a motherboard and IDE cables by spinning with the assistance of delicate, fragile magnetic platters on which data is saved. These HDDs use precision-etched surfaces that have been covered with a layer of magnetized material to encode electronic information encrypted with error-correcting codes so it can be retrieved after being read by an electron beam reader head placed over them within close proximity. The capacity of a HDD is measured in gigabytes (GB) and terabytes (TB).
Hard drives are a popular type of secondary storage. They have a fast seek time and can save a lot of data but they are vulnerable to damage. The most common issues with hard drives are overheating, physical damage, and data corruption as a result of power loss.
SSDs are non-volatile solid-state memory devices that store persistent memory in the form of flash memory. They are made up of integrated circuits that have been designed using semiconductor fabrication techniques to store information. SSDs use NAND-type flash memory and store data in cells composed of a nonmetallic conductive layer (the floating gate) and a metallic ground layer. The cells are placed on a silicon based substrate. Flash memory is fast, secure and reliable but it does not retain data after it loses power. Instead of reading and writing data randomly, SSDs read the data sequentially so they use less power.