Sequential Bandwidth Per Drive (Consumer SATA) Trend Year Sequential Bandwidth (MB/s) 2011 64 2012 71 2013 79 2014 89 2015 99 2016 111 2017 124 2018 139 2019 156 2020 174 2021 195 2022 218 2023 244 2024 273 2025 305 2026 342 2027 382 2028 427 2029 478 Description [1] gives a good description of the relationship between capacity and sequential bandwidth estimates. Basically, since bandwidth is proportional to linear density times rotation speed, assuming rotation speeds will stay constant over time, and that linear density is proportional to the square root of the areal density, we get: 2TB drives: 50 MB/s 4TB drives: 71 MB/s 8TB drives: 100 MB/s 16TB drives: 141 MB/s 32TB drives: 200 MB/s 64TB drives: 283 MB/s 128TB drives: 400 MB/s These number are equivalent to a 40% increase every 3 years. Our initial value is 71 MB/s with 4 TB drives in 2012. References [1] Document-11673 Sequential Transfer Rates: An examination of its effects on performance http://www.storagereview.com/articles/9910/991014str.html [2] Document-11580 Seagate Barracuda Green 2TB Review
Sequential Bandwidth Per Drive (Consumer SATA) Trend Year Sequential Bandwidth (MB/s) 2011 64 2012 71 2013 79 2014 89 2015 99 2016 111 2017 124 2018 139 2019 156 2020 174 2021 195 2022 218 2023 244 2024 273 2025 305 2026 342 2027 382 2028 427 2029 478 Description [1] gives a good description of the relationship between capacity and sequential bandwidth estimates. Basically, since bandwidth is proportional to linear density times rotation speed, assuming rotation speeds will stay constant over time, and that linear density is proportional to the square root of the areal density, we get: 2TB drives: 50 MB/s 4TB drives: 71 MB/s 8TB drives: 100 MB/s 16TB drives: 141 MB/s 32TB drives: 200 MB/s 64TB drives: 283 MB/s 128TB drives: 400 MB/s These number are equivalent to a 40% increase every 3 years. Our initial value is 71 MB/s with 4 TB drives in 2012. References [1] Document-11673 Sequential Transfer Rates: An examination of its effects on performance http://www.storagereview.com/articles/9910/991014str.html [2] Document-11580 Seagate Barracuda Green 2TB Review