WD Red Plus
4 TB, 3.5", CMR
Questions about WD Red Plus
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This is completely normal. This can be explained by the way an HDD works, because the read/write head of the HDD has to "jump" to reach the corresponding sectors. So if you "read" or "write" different things at the same time, the head will have to jump back and forth faster or more often. Defragmenting helps if the sectors of a file are not in a row ... then the clacking may become quieter. But the hard drive is still one of the quietest I have in my NAS.
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It depends. If one disk is defective, you can replace that one. If you want to increase the size of the raid, you have to replace all 4.
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The WD Red (Plus) is simply optimised for NAS. But you can also use it on a normal PC without any problems.
According to the specs, the old one should be able to do 150MB/s, you can also test it at home, only SSDs can do 750MB/s and more. Datasheet of the old one: https://www.compare.de/datacontent.php?EAN=0718037810058 Difference to the new one will be SMR/CMR, there are already many threads about this, maybe this link will help you https://www.hardwareluxx.de/community/threads/unterschied-zwischen-wd40efax-und-wd40efrx.1266616/
Well, there are errors everywhere where work is done, it's great when you report errors.
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This ending in the model designation "...EFZX" shows that this is a CMR hard disk. SMR has the suffix "...EFRX".
7200rpm is about 20% faster. 5400rpm ~ 100mb/s, 7200rpm ~ 120mb/s
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