That coating stores your data, whether that data consists of weather reports from the last century, a high-definition copy of the Star Wars trilogy, or your digital music collection. Hard drives are essentially metal platters with a magnetic coating. That is, it doesn't "go away" like the data on the system memory when you turn the system off. HDD and SSD Explained The traditional spinning hard drive (HDD) is the basic nonvolatile storage on a computer. But how do you choose? We explain the differences between SSDs and HDDs, and walk you through the advantages and disadvantage of both to help you come to your decision. Now, you can configure your system with either an HDD, SSD, or in some cases both. Every other desktop or laptop form factor had a hard disk drive (HDD). If you bought an ultrabook or ultraportable, you likely had a solid-state drive (SSD) as the primary drive (C: on Windows, Macintosh HD on a Mac). Until recently, PC buyers had very little choice for what kind of file storage they got with their laptop, ultrabook, or desktop.
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