this post was submitted on 28 Jul 2023
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Sometimes it's because they use cheap Shingled Magnetic Recording (SMR) drives in the external enclosures. These drives are slower and less reliable than the Conventional Magnetic Recording (CMR) drives. Some of the cheaper internal drives are also SMR these days. An SMR drive is OK if you just want to write data to it and leave it there, and you're not too worried about the transfer speeds. But if you're doing a lot of intensive activity with many writes and rewrites, it'll slow you down.
They are often Green drives as well. But the latest 10TB ones I bought and shucked a few days ago from WD are not SMR as far as I know? If you are careful with the disassembly and buy from a place with a good returns policy you can always return it if it's SMR.