SergeantCC4 Posted February 21, 2020 Share Posted February 21, 2020 So I recently purchased a 6TB Blue drive to expand my array. I understand from reading certain topics in the past that the preclear step isn't required anymore, but I like to do it anyway (old habits die hard). While preclearing my disk (WD60EZAZ) the UI reported that the drive was doing the pre-read at +393MB/s. AFAIK it is impossible for spinning disks to read data that fast. Not that I'm complaining per se I just want to make sure nothing is wrong with the disk. I was running the preclear add on from within the webUI for the disk above as well as a shucked one at the same time (WD80EMAZ). The other disk showed common speeds (100-200MB/s for r/w) Has anyone else seen this type of behavior before? Thanks in advance for any clarification anyone light offer. Quote Link to comment
JorgeB Posted February 21, 2020 Share Posted February 21, 2020 That because those SMR drives don't read the platters when they know there's no data there, do a full write and then you'll get the actual read speed from the platters. 2 Quote Link to comment
SergeantCC4 Posted February 21, 2020 Author Share Posted February 21, 2020 Ok. So I need to load some data onto it first. It had me worried when it finished in 1/4 the time it took an 8TB drive to do the same. Thanks! Quote Link to comment
JorgeB Posted February 21, 2020 Share Posted February 21, 2020 Yeah, they are weird like that, even the long SMART test completes in a few seconds before they are used for writes. Quote Link to comment
JorgeB Posted February 21, 2020 Share Posted February 21, 2020 And because of that there's no point in doing a pre-read when pre-clearing a new one, just clear and post-read. Quote Link to comment
SergeantCC4 Posted February 21, 2020 Author Share Posted February 21, 2020 Yea I noticed that the pre-read finished in a few hours but after it cleared the disk and zeroed everything the verification took a while. I tried to read the long topic about the SMR drives but it seed like the consensus was that they're good to use as data drives if I understood correctly. Quote Link to comment
JorgeB Posted February 21, 2020 Share Posted February 21, 2020 They are usually fine with Unraid, they should be avoided for any kind of RAID. Quote Link to comment
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