These drives are basically a type of flash memory, where data is written onto chips rather than magnetic platters - that means no moving parts, which in turn means faster read/write speeds as well as (in theory) increased long-term reliability. In recent years we have witnessed the solid-state drive revolution. These traditional hard drives have largely fallen out of favor for use as system drives, but their larger capacities and much cheaper per-gigabyte cost means they are still a very popular choice for external storage use. These have moving disks (called platters) inside, where the data itself is written and read. Most hard drives, until recently, were mechanical HDDs.
Storage drives mostly fall into two main categories: traditional hard drives, or HDDs, and solid-state drives, or SSDs. For more details about external hard drive designs and features to look for when making your purchase decision, read on. If your external HDD or SSD is just for file storage, then this is rather simple, but if you’re going to be regularly reading and writing to your external storage (for example, doing video editing right from the drive itself rather than from your computer’s system drive), you’ll want to be sure you get something that has good read and write speeds and that uses up-to-date connectivity standards such as USB 3.0. What exactly you are using your hard drive for will also factor into your purchase decision.
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If, on the other hand, you’re frequently ferrying data around from one PC to the next, then a portable hard drive might be a better choice, even if you’re sacrificing some storage space for a smaller footprint. As cheap as storage is per gigabyte nowadays, the classic trade-off of hard drive size versus portability still holds basically, is your primary consideration storage space or physical size? If your external hard drive is for home and office use at a single workstation and will more or less sit in one place, then storage space is more valuable than mobility. The first two steps of choosing an external hard drive are setting your budget and determining what size you need.
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