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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 SMR allows vendors to offer higher capacity without the need to fundamentally change the underlying recording technology.

ST2000LM015 Seagate 2.5″ hard drive with a storage capacity of 2TB and featuring a SATA interface. ST2000LM015 Seagate BarraCuda Pro 2TB 5400RPM SATA 6Gb/s 128MB Cache 2.5-inch Hard Drive. 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 The BarraCuda is very economical, compact, quiet and at the same time extremely fast, even in comparison with many HDDs from other manufacturers. n) HiSMRFs research file system for SMR: 2014, https://www.researchgate.net/public...rmance_file_system_for_shingled_storage_array

Seagate platter sizes 2.5": https://rml527.blogspot.com/2010/09/hdd-platter-database-seagate-25.html 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. New technology such as HAMR (Heat Assisted Magnetic Recording, Seagate) or MAMR (Microwave Assisted Magnetic Recording, WD) can be used with or without shingling. The first drives are expected in 2020, in either flavor. 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. Seagate is a real industry giant in the hard drive market, where you can barely get past if you want to build a high-memory PC system. The range of models covers all segments - from small (2.5 inches) to large (3.5 inches), from green IT (at lower speeds) to high-speed (at 7,200 rpm), from home users to professional environment.

HGST Host-Managed SMR DataCenter drives: https://www.westerndigital.com/products/data-center-drives/ultrastar-dc-hc600-series-hdd Anandtech lists Seagate 2.5" Barracuda as SMR: https://www.anandtech.com/show/1075...5-mobile-hard-drives-with-up-to-5-tb-capacitySeagate datasheet for 8TB Archive v2 showing HA-SMR: https://www.seagate.com/www-content...seagate-archive-hdd/en-us/docs/100795782a.pdf

Toshiba's list of DM-SMR drives: https://toshiba.semicon-storage.com/ap-en/company/news/news-topics/2020/04/storage-20200428-1.html |WD data sheet for WD Red, note 256MB cache suggesting DM-SMR: https://documents.westerndigital.co...et-western-digital-wd-red-hdd-2879-800002.pdf 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 Seagate presents the BarraCuda, an extremely versatile and reliable HDD storage device that provides ample space for all types of files. Ideally, the disk can be used in laptops, mobile storage, external storage systems, all-in-one PCs, or ultra-thin desktop PCs. Especially useful is the multi-tier caching technology used, which allows applications and files to load faster than ever from the HDD. Responsible for this are intelligent NAND flash levels, DRAM and media cache technologies, which optimize the data flow and improve the reading and writing performance.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

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“. All 2-6TB external drives - Elements, My Book, Easystore, etc. Precise models vary and are not guaranteed; assume SMR in capacities below 8TB. l) OpenZFS Office Hour discussion on SMR: 2015, SMR, Resilvering, Possible Solutions at around 20, 31 and 46 mins respectively, https://youtu.be/mS4bfbEq46I?t=1220 WD platter sizes 2.5 niche products: https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-25_2393.html

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WD platter sizes 2.5": https://rml527.blogspot.com/2010/10/hdd-platter-database-western-digital-25.html p) Manylogs concept, platters would need SMR and CMR sides: 2016, IEEE, https://ieeexplore.ieee.org/document/7897075 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 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.

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