All Red Labeled Western Digital are top products for storage/NAS/SAN purposes and this drive is no exception. Also noticed that the 6TB is a bit quieter than their 4TB predecessor. It's an amazingly good product and an extremely good value for money. Western Digital, ALWAYS! Hitachi/HGST are mostly known for both excellent reliability and good performance and many of us found it sad that WD killed the brand but think it's reassuring that the technology is reused in WD products. If it's true that the newer 6 TB WD Red are also HGST inside, then obviously that specific low power technology isn't the best. Though I can't remember hearing anything bad at all about the HGST low power products when they had those. My 10 year old DeskStars are still doing service today along with some 9 year old UltraStars in my main Qnap unit and the performance is decent considering their age. Those very old disks are actually much better than your WD60EFAX (120-140MB/s). Considering the extreme performance difference you see, have you looked at the detailed SMART data? Maybe you can spot an issue there? SMART ID #199 for instance... Shingled Magnetic Recording (SMR) technology helps hard drive manufacturers to produce HDDs with larger capacity.

Thanks @sretalla thanks for the info re purples... I'll keep that in mind when I look at expanding if the pricing works... not too attractive at this moment. That's a welcome announcement for users who want to make the decision of when, and where, to use SMR drives in their systems and NAS arrays. Turns out while both are offered as RED drives the EFRX is native Western Digital, EFAX is a drive technology acquired as part of Western Digital integration of Hitachi Global Storage and built in a different factory and probably has many other differences than just cache. Error recovery controls: WD Red™ NAS hard drives are specifically designed with RAID error recovery control to help reduce failures within the NAS system.Ideal for Home Offices, Power Users, Small to Medium Businesses and Consumer/Commercial NAS systems

Compatibility: Unlike desktop drives, WD Red hard drives are specifically designed and tested for NAS and include NASware™ technology which fine tunes drive parameters to match NAS system workloads for optimum performance. The table above lists the WD drives that come with SMR technology and the drives that use the faster conventional magnetic recording (CMR). Importantly, the blog states, "...Thank you for letting us know how we can do better. We will update our marketing materials, as well as provide more information about SMR technology, including benchmarks and ideal use cases." Use this modified string, for example "HUH7280??ALE60?" to search for model name in the tables below. Any capacity drive is from the same family as the found model name and all the fields from the found table row are valid for it, meaning HUH728060ALE601(6TB) and HUH728080ALE600(8TB) are from the same family. The local distributor did not have WD60EFRX available and offered me a RED WD60EFAX at the same price which was supposed to be the same, newer, but a bit better - more cache. The logic was it wont be any better in your NAS but it wont be any worse. FANS: 3xFractal R3 120mm - 3 Front, 1 Rear. Corsair Commander Pro to control the fans (see script and code)As I write this I can see a pile of 9 similar hard discs, all made by Seagate or one of their badge engineered names. They are all faulty and in under 4 years. Two 5 year warranty Seagate drives failed but were replaced under warranty. Also on the pile there are two WD discs, one was over 7 years old and the other almost 10 years old when they failed. We have 20+ WD disks in use, mostly in NAS units running RAID and on 24/7 and the last two remaining Seagate units which I would only ever use in a RAID array as I don't trust them. This is a review of a WD disc, so I expect it to last well beyond its warranty period and would recommend to all Reliability: Desktop drives aren’t typically designed for the demands of an always-on NAS environment. WD Red hard drives are designed to perform under tough conditions encountered in high-intensity 24x7 multi-user NAS environments.

SMR does result in lower performance, but it enables cost savings that are attractive to some users, and if used in the correct types of workloads, those savings are worth the exchange of gaining access to deeper capacity. However, using SMR tech for desktop and laptop boot drives will likely remain a topic open for debate, as their underwhelming performance in sustained random write workloads could hamper performance in standard operating systems. SuperMicro X11SSH-F, Intel E3-1225 v6 (Plex hw transcode broken); 64 GiB (4x16) Crucial/SuperMicro ECC DDR4 UDIMM They really aren't, see viewtopic.php?f=45&t=154346 What a scam.Well that explain the slowness and inconsistency. HGST naming convention: all model names in this naming convention start with letters "W" or "H", and there is no dash in the model name, for example HUH728080ALE601, WUH721010AL42L4.

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If your drive is not found in this guide, please send me pictures from both, the label and the PCB sides of the HDD (or full model and serial number if you cannot take the pictures) and I'll try to add your drive to the guide. WDC naming convention: all model names in this naming convention start with letters "WD", WDC full model name would aslo have a dash, for example WD60EFRX-68L0BN1. Im at a bit of a crossroads here and was hoping for some advice. Right now there is only about 3tb of data on the entire nas while it reshapes. But i had about 5tb more ready to load onto the nas soon as it was going to complete. My initial thought was to buy another older WD60EFRX and soon as the raid reshape was completed I would pull the newer SMR drive and put in the WD60EFRX and let the system repair. Few of them are SMR and other are CMR drives. You can identify them here https://nascompares.com/answer/list-of-wd-cmr-and-smr-hard-drives-hdd/ The WD Elements 8TB has a HGST He8, Helium. The WD Elements 10TB is the WD Red Plus Air model. The 12TB and 14TB I am not 100% sure, but I think it's HGST Helium again. The 2-6TB models have WD SMR drives (might be Red SMR), avoid like the plague.