We tested both sequential and random speeds. Drive speed: SSDs provide dramatically faster transfer speeds than mechanical drives, so there’s less waiting for files to copy.For example, we note when reviewers mention that their SSDs run hot too much heat during operation can shorten the drive’s life or indicate that the drive is defective. Since SSD manufacturers don’t report durability ratings for external drives (only for internal models), we keep an eye on buyer reviews for reliability information. But better endurance is a bonus, especially if you’re using your drive for high-intensity tasks such as 4K video editing. You’d have to write hundreds of terabytes of data to even begin to wear out most SSDs, though, and few people approach that limit. Endurance: Flash-memory cells can be written to only so many times before wearing out.A portable SSD should also be sturdily built and not feel creaky or hollow. Since portable SSDs lack moving parts, they are less susceptible than mechanical drives to total failure when dropped, jostled, or subjected to changes in temperature or vibration. Reliability and toughness: A portable SSD must keep your data safe.
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