The Thailand drives have a 256mb cache and the China ones are allegedly only 128mb. Beware of using "PMR" as a term, SMR (shingled) is an extension on PMR and if you use this instead of "CMR" (for 'conventional') the drive makers will latch on it to twist words and block your complaints - I've already found this out the hard way, and the fact that they're resorting to weasel-activities like that shows they know that they have created problems. No reason to go SMR if PMR equivalents are available. 원가절감형 smr 방식이 아니라 기존 방식인 cmr (pmr) 하드입니다. I had never heard about this spec before. Perpendicular magnetic recording (PMR) or conventional magnetic recording (CMR) Description: The magnetization vector for each bit of information (magnetic domain – cell) is located perpendicular to the surface of the carrier.The magnetization of the working layer (hard magnetic layer or perpendicular thin-film medium) is carried out using an orienting sublayer (soft magnetic underlayer). Best to avoid those "EFAX" drives then. The entire WD Red SMR product line is a frankly defective when used in a NAS or RAID and was falsely advertised. WD80EFAX (WD Red 8TB - SMR) WD60EZAZ (WD Blue 6TB - SMR) WD6003FRYZ (WD Gold 6TB - PMR) DC HC320 (8TB Ultrastar DC - PMR) I know some people have reported on the old versions but haven't seen on the newer models. IIRC the seagate SMR was something like 80GB SMR, 20GB CMR, 80GB SMR, 20GB CMR and that was still too much for normal multi-tasking use of the drive. To znamená, že po zaplnení cache (10 - 20 GB, podľa disku) začne disk prehadzovať dáta z cache do SMR oblasti, zatiaľ čo stále tečú nové dáta. Seems like it's impossible to figure out whether they are CMR/PMR or SMR.--John. Using SMR technology instead of conventional magnetic recording allows HDD manufacturers to put out denser drives at cheaper prices. User #346217 24350 posts. For up to 24 bay medium to large-scale NAS environments, the WD Red Pro drive is engineered to handle increased business workloads and carries a 5-year limited warranty. Seek time (read in ms) Avg. That level of SMR on a black is just not acceptable. If you have been following the online forums, there have been multiple reports on SMR drives being shipped by a few vendors without disclosing this fact. The tracks are perpendicular, they are also shingled - layered - on top of each other. Older Reds were either SMR or CMR/PMR, I believe any WD that is 8tb+ is all CMR/PMR. I'd still recommend the NAS RED (WD80EFAX). Not talking about it is a bigger issue even if I could see myself accepting 10-20% of the drive was SMR. This table will use CMR (Conventional Magnetic Recording) to mean "PMR without the use of shingling". Today, we are going to look at the first helium-filled WD Red model – the 10TB WD Red (WD100EFAX) NAS drive!. Am not particularly fond of SMR. And Im learning that this new drive is a SMR drive. As the industry evolves to develop purpose-built solutions for growing data storage requirements, IT managers continue to rely on mid-range capacity drives that are economical to acquire, yet deliver quick and … Receive free standard shipping (UPS Ground) on eligible purchases delivered within the contiguous United States, excluding addresses in Hawaii, Alaska, Puerto Rico and other U.S. territories. The WD Red Family I verified the 256mb cache on my Thailand drive (WD80EFAX … Its a WD60EFAX. SMR is a form of PMR (Perpendicular Magnetic Recording). All the drives I've shucked have been essentially rebadged reds, both 8tb and 10tb drives. WD60EFAX was known to be SMR though. I found this out from a YouTube video by JDM_WAAT published on 7/26/2017 titled "Western Digital Easystore 8TB (WD Red inside) unboxing and shucking. 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