Seagate BarraCuda 2 TB Internal Hard Drive HDD – 2.5 Inch SATA 6 Gb/s 5400 RPM 128 MB Cache for PC Laptop (ST2000LM015)

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WD platter sizes: https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-35_9883.html a) HA-SMR and HM-SMR in ZFS: 2014, Tim Feldman of Seagate, http://open-zfs.org/w/images/2/2a/Host-Aware_SMR-Tim_Feldman.pdf Toshiba platter sizes 2.5": https://rml527.blogspot.com/2010/09/hdd-platter-database-toshiba-25.html j) BPR is so complex no new features can be added afterwards: 2020, BSD Now podcast, from roughly 22:00, https://www.bsdnow.tv/340 WD platter sizes niche products: https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-35.html

While the vast majority of the Seagate BarraCuda 2.5" 4 TB HDDs will use a four-platter configuration, some Seagate customers have apparently requested a five-platter configuration. Obviously, being based on 800 GB platters, such drives have lower areal density and, perhaps, different performance and behavior. n) HiSMRFs research file system for SMR: 2014, https://www.researchgate.net/public...rmance_file_system_for_shingled_storage_array To a large extent, Seagate’s multi-tier cache determines the performance of the company’s BarraCuda 2.5" and Mobile HDD drives. For example, when Seagate announced its Mobile HDD products earlier this year, the company declared maximum sustainable transfer rate of the HDD at 100 MB/s. However, the documentation was altered later in the summer to reflect a maximum transfer rate of 140 MB/s (possibly due to updated firmware, or a change in the performance measurement method). Now, the high-capacity BarraCuda 2.5” (3 TB, 4 TB and 5 TB) drives are rated for 130 MB/s, while the mainstream BarraCuda 2.5” (500 GB, 1 TB and 2 TB) are rated for 140 MB/s. This is still below the 145 – 169 MB/s offered by PMR-based Laptop HDDs from the company. Seagate BarraCuda 2.5" HDDs SMR has worse sustained write performance than CMR, which can cause severe issues during resilver or other write-intensive operations, up to and including failure of that resilver. It is often desirable to choose a CMR drive instead. This thread attempts to pull together known SMR drives, and the sources for that information.

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When it comes to data recovery one of the most common problems Seagate ST2000LM015 Hard Disk Drive experience is burnt circuit board(PCB). So if you will need to match a replacement PCB, it is important that you note the “ Board Number” of your current circuit board in addition to the hard drive’s “ Model Number“. Seagate platter sizes 2.5": https://rml527.blogspot.com/2010/09/hdd-platter-database-seagate-25.html

HGST Host-Managed SMR DataCenter drives: https://www.westerndigital.com/products/data-center-drives/ultrastar-dc-hc600-series-hddThe BarraCuda is very economical, compact, quiet and at the same time extremely fast, even in comparison with many HDDs from other manufacturers.

WD platter sizes 2.5": https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-25.html Seagate datasheet for 8TB Archive v2 showing HA-SMR: https://www.seagate.com/www-content...seagate-archive-hdd/en-us/docs/100795782a.pdf Anandtech lists Seagate 2.5" Barracuda as SMR: https://www.anandtech.com/show/1075...5-mobile-hard-drives-with-up-to-5-tb-capacity q) Toshiba presentation on SMR technology: 2015, https://www.toshiba.co.jp/tech/review/en/01_02/pdf/a08.pdf Seagate has formally introduced a new family of hard drives in the 2.5” form-factor. It is designed for laptops as well as external storage solutions. The new BarraCuda HDDs are based on 1 TB shingled magnetic recording platters and Seagate’s multi-tier caching technology. They enhance the maximum capacity of the company’s 2.5” HDDs to 5 TB - making the BarraCudaST5000LM000 the world’s highest-capacity 2.5” hard drive.

Drive Managed, DM-SMR, which is opaque to the OS. This means ZFS cannot "target" writes, and is the worst type for ZFS use. As a rule of thumb, avoid DM-SMR drives, unless you have a specific use case where the increased resilver time (a week or longer) is acceptable, and you know the drive will function for ZFS during resilver. See (h) If newer firmware is available for your drive, it will reflect the improvements we have engineered for the latest manufacturing. Firmware for legacy products will be the final release from manufacturing. Please note that Seagate does not offer details about specific firmware. o) Poster for Zone-based Storage Tiering for HA-SMA: 2017, University of Minnesota, https://sc17.supercomputing.org/SC17 Archive/tech_poster/poster_files/post204s2-file2.pdf Host Aware, HA-SMR, which is designed to give ZFS insight into the SMR process. Note that ZFS code to use HA-SMR does not appear to exist. Without that code, a HA-SMR drive behaves like a DM-SMR drive where ZFS is concerned.