If it isn't externally powered, will it be slower? That's the big question. External doesn't always mean portable, sometimes it is just for convenient access, after all, disk arrays are "external" and they aren't portable at all. Having been burned by extremely slow external enclosures because there wasn't sufficient power, I wouldn't take the chance when seeking SSD performance.
I've been using an m.2 SATA SSD in a nearly indestructible USB3 enclosure for a few years. No external power needed, but the m.2 2242 format wasn't something I specifically selected - it was just the size pulled from a chromebook. Wish I would have purchased an m.2 2280 size instead for some flexibility. I don't know if Samsung ever made that type/size. I have a kingston, but it is only 16G, so not so useful these days.
Options:
- 2.5 inch SATA SSD
- m.2 SATA 2280 size SSD
- m.2 NVMe 2280 size SSD (2x the cost)
Just depends on how flexible you want the external "dock"/enclosure to be.
The 2x cost makes NVMe for USB3 not-worth-the-price to me.
I've had a few SSDs fail over the years. Be certain you know the SSD characteristics will meet your needs. To me, speed is less important than Endurance/durability specifications. But we are all different.
Often, external enclosure SSDs have much shorter warranties, so be certain to consider that. It isn't like these have any moving parts.
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