An external SSD has no moving parts, unlike the mechanical HDD, which has to wait for platters to spin up and down when reading and writing data. Just as an internal SSD outperforms an internal HDD due to how each type of drive is constructed, the same logic follows for their external counterparts. There are two main differences between an external SSD and an external HDD. Both can easily back up the data from a PC or laptop. Both offer more storage space than USB flash drives. When it comes to the main purposes of an external drive, whether it be a mechanical drive or a solid state drive, both categories satisfy similarly. Just a few years ago, internal SSD hard drives were so expensive that external SSD hard drives were out of the question. However, the prices for SSDs are continually falling year over year, almost reaching parity with their mechanical counterparts in some cases. Solid state drives (SSD) are a relatively new technology, which makes SSDs more expensive than traditional mechanical hard drives.
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