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The Billion-Dollar Bet on the Future of Magnetic Storage (ieee.org)
For several decades, the areal density of hard disks increased by an average of nearly 40 percent each year. But in recent years, that rate has slowed to around 10 percent. Seagate and Western Digital, the leading manufacturers of hard drives, differ with each other on how to get around this. From a report: In back-to-back announcements in October 2017, Western Digital pledged to begin shipping drives based on what is known as microwave-assisted magnetic recording (MAMR) in 2019, and Seagate said it would have drives that incorporate heat-assisted magnetic recording (HAMR) on the market by 2020. If one company's solution proves superior, it will reshape a US $24 billion industry and set the course for a decade of advances in magnetic storage. Companies that wish to store huge amounts of data do have other options, but hard drives are still the go-to choice for enterprise storage needs that fall somewhere between faster, more expensive solid-state drives built on flash memory, and slower, cheaper magnetic tape.
Seagate now aims to debut a 20+ terabyte drive based on HAMR in 2020, and Western Digital promises MAMR drives that will hold roughly 16 TB later this year. Western Digital expects to quickly scale up to MAMR drives with 40 TB of capacity by 2025, while Seagate believes it can achieve similar capacities through HAMR, though it has not publicly stated a target date. Both companies are essentially starting from the same place, with hard drives that share a few key components. The disk, for example, is a thin platter that has been coated with some form of magnetic material made up of countless individual grains, each of which is magnetized in one particular direction. Ten or so grains in a cluster, all with magnetization pointing in the same direction, represent a bit.
Seagate now aims to debut a 20+ terabyte drive based on HAMR in 2020, and Western Digital promises MAMR drives that will hold roughly 16 TB later this year. Western Digital expects to quickly scale up to MAMR drives with 40 TB of capacity by 2025, while Seagate believes it can achieve similar capacities through HAMR, though it has not publicly stated a target date. Both companies are essentially starting from the same place, with hard drives that share a few key components. The disk, for example, is a thin platter that has been coated with some form of magnetic material made up of countless individual grains, each of which is magnetized in one particular direction. Ten or so grains in a cluster, all with magnetization pointing in the same direction, represent a bit.
Sony and Panasonic are the only ones working on it with a goal of shipping products, as far as I can tell. They've got Archival Disc, which is an extension of BluRay, which currently holds 300GB per disc (two sides, each with three layers, 100GB per layer), with plans for up to 1TB per disc on the roadmap. It's basically an extension of BDXL.
They missed their key ship dates, and at present the discs are only commercially available inside of Sony's Optical Disc Archive format, which is basically a cartridge containing many double-sided discs. Current capacities top out at 1.5TB for read/write cartridges, and 3.3TB for write-once cartridges.
I am 100% sure that there are use cases today for Cheap Dense Slow Storage. Mostly for long term /archival storage. Anything that needs access to a processor will want / require Solid State.
Systems and applications that require really fast storage will require DRAM. Flash is way too slow compared to DRAM. On the other hand, many data centers are extremely cost sensitive. These data centers account for many tens (hundred?) of millions of annual HDD unit sales. Many large internet companies require massive cold storage, i.e., data that is needed maybe a few times a year or less but which need to be retrieved in a few seconds when needed (e.g., think about the tail end of the distribution for Facebook browsing or Google search queries). For cold storage, flash is too expensive, and tape is too slow.
Even though flash prices have been dropping rapidly, they still have not gotten close to HDD prices. As a point of comparison, take a look at average price charts for various capacities of HDDs and SSD. Based on this webpage, the average large-capacity SSD price is around $250/TB, while the average large-capacity HDD price is around $40/TB. This roughly 5x price difference has held steady for many years. More importantly, HDDs have held this price advantage in the last decade without the usual historical once-per-decade technology disruptor. PMR was the last mini-disruptor ten years ago. HAMR/MAMR/bit-pattern has been promised for a very long time, and the price difference relative to flash will only increase when these new disruptors are commercially ready.