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A comment on Modern HDDs have gotten somewhat better. Parent comment

Re:Modern HDDs have gotten somewhat better by antongribok on Wednesday June 22, 2022 @01:39PM (#31839216)
For 1 drive, the differences are perhaps not much. When you have a cluster with 2k HDD drives, the difference in handling both squential and random workloads (see my other comment) can add up.

A 2.5x difference in IO/s adds up quickly.

As for HDD prices, neither 12TB nor 8TB were top of the line at the timeframes you mention. If you buy largest available drives, or a model lower, the prices have been going down. Not as much as we all would like, but overall the trend has been moving in the downward direction.

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Re:Modern HDDs have gotten somewhat better by Melatonic on Wednesday June 22, 2022 @04:03PM (#31841160)
The helium filled drives also appear to be much, much more reliable. Only thing that worries me about them is that if you need to do disaster recovery you are pretty much out of luck unless you can get the original manufacturer to do it or find a highly specialized place.
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