Best to avoid those "EFAX" drives then. No reason to go SMR if PMR equivalents are available. This interest led Western Digital to create the WD Red NAS-optimised family of hard disk drives. SMR lemezeknél 256 MByte-os zónák vannak, mert ez az optimális érték. I'd still recommend the NAS RED (WD80EFAX). Buy WD Red 6TB NAS Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, SMR, 256MB Cache, 3.5" - WD60EFAX with fast shipping and top-rated customer service. The goal wasn't to maximize the space on the platter - instead they were just aiming at getting to 2 TB. This is all news to me. As recently as March-April Western Digital was claiming these drives were not SMR, they didn't admit it and identify the drives until April … Am not particularly fond of SMR. The WD Red Family Some reviews I found said the warm boot issue was fixed and others say it's still a problem so confused. The tracks are perpendicular, they are also shingled - layered - on top of each other. SMR disk vždy zapíše nové dáta do PMR cache a až potom "upratuje". On that note, watch out if you're shucking Seagate 4TB portable externals. Newegg shopping upgraded ™ The popularity of Network-Attached Storage (NAS) systems has fuelled a surge in demand for large capacity hard disk drives. hc320 vs hc510, Buy Western Digital Ultrastar 10TB DC HC510 7200 RPM SATA 6.0Gb/s 3.5" Data Center Internal Hard Drive - 0F27606 with fast shipping and top … And Im reading that It should never be mixed with PMR drives in a raid 6 or SHR2 configuration. Seems like it's impossible to figure out whether they are CMR/PMR or SMR.--John. Buy WD Red 4TB NAS Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX with fast shipping and top-rated customer service. SMR is a form of PMR (Perpendicular Magnetic Recording). Here is the full scoop on this What the fuss is about Technology used in Hard drives today is PMR - Perpendicular magnetic recording. Not talking about it is a bigger issue even if I could see myself accepting 10-20% of the drive was SMR. Around ~Dec 2016, they quietly switched from ST4000LM016 (PMR) to ST4000LM024 (SMR). That level of SMR on a black is just not acceptable. User #346217 24350 posts. ... WD80EFAX is not SMR I think? 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. 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. And upon further reading I just learnt about SMR and PMR drives. This table will use CMR (Conventional Magnetic Recording) to mean "PMR without the use of shingling". The WD Red and Seagate IronWolf have separate, but similar techniques to work better with your NAS. 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. Hello, Sign in. PMR/CMR lemezeknél kb minden 512byte vagy 4K szektornak megvan a helye, és ha a szektor kiírásra kerül, akkor az ott is marad. PMR/CMR lemezeknél kb minden 512byte vagy 4K szektornak megvan a helye, és ha a szektor kiírásra kerül, akkor az ott is marad. 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). Sustained Transfer Rate OD (MB/s) from Product sheet: Max. Seek time (write in ms) Avg. * Excluding taxes and shipping costs; after any applicable coupons have been applied. Bocsi, este van és felcseréltem a kettőt ebben a mondatban SMR <-> PMR(CMR). Sustained Transfer Rate OD (MB/s) from Product manual: Spindle Speed (RPM) Cache: Workload Rate Limit: Avg. 现有的pmr技术，在2.5寸一般是500g左右，最大可以到700g，在3.5寸一般是1tb左右，最大1.5tb，单碟容量一旦超过这个值，就大概率是smr盘了。 单碟容量1.5T已经有实锤的SMR盘了，原因同上，省成本 So they might have ended up with fairly small SMR zones (or a generous CMR zone). Rýchlosť zápisu poklasne, rýchlosť závisí od toho, koľko musí seekovať medzi PMR cache a SMR … ™ the WD Red NAS-optimised family of hard disk drives drive is a frankly defective used. 'D still recommend the NAS Red ( WD80EFAX ) be mixed with drives... Aiming at getting to 2 TB been essentially rebadged Reds, both and! Kiírásra kerül, akkor az ott is marad ebben a mondatban SMR < - > PMR ( CMR ) advertised! 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