News Samsung 30.72 TB SSDs: Mass Production of PM1643 Begins


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Samsung this week announced that it has started mass production of its PM1643-series SSDs. These are monstrous data storage devices, with up to 30.72 TB capacity each. The new drives use Samsung’s 64-layer 512Gb TLC V-NAND memory chips stacked in 1 TB packages. Later this year Samsung plans to expand the PM1643 lineup with SSDs featuring other capacities.

Samsung’s PM1643 30.72 TB SSD is the company’s highest-capacity mass-produced drive to date. It is designed primarily for read-intensive workloads, and features an SAS-12 Gbps interface. Samsung rates its PM1643 for one DWPD (drive write per day) throughout five years, which indicates a very high endurance of roughly 56 PB for the drive. The choice of the interface and robust endurance rating naturally suggest that we are dealing with a drive for mission-/business-critical applications. Some of the features of the PM1643 that Samsung is willing to discuss right now (metadata protection, power loss protection, data recovery, etc.) confirm that the drives are indeed aimed at servers that require advanced reliability.

The PM1643 is based on Samsung’s proprietary controller architecture as well as 512 Gb 64-layer TLC V-NAND memory chips - 16 of them are stacked together to create 1 TB packages, over 40 of such packages are used for the 30.72 TB drive, giving sizeable overprovisioning. The new SSDs also carry 40 GB of stacked DDR4 memory (8 Gb DRAM chips interconnected using TSVs), which is in line with the configurations of other drives.

When compared to the previous-generation PM1633a SSDs released in 2016, the new PM1643 offers both double the capacity and also considerably on-paper higher performance. Samsung claims that the PM1643 30.72 TB SSD features sequential read and write speeds of up to 2100 MB/s and 1700 MB/s, respectively. As for peak random read/write performance, the new PM1643 drive is rated for 400K and 50K IOPS, respectively. Samsung yet has to announce sustained sequential and random performance numbers, but it is clear that the new SSDs are intended faster than their direct predecessors.

The Samsung PM1643 SSDs will come in a 2.5-inch form factor, but at 15mm. These will be drop in compatible with systems that use the PM1633-series drives. Unfortunately, peak power consumption of the new SSDs remains undisclosed, but it is highly likely that GB-per-Watt consumption of the new drives does drop compared to the previous-gen models. If we get this information, we will update the table..

General Specifications of Samsung PM1643 and PM1633a SSDs
PM1643 30.72 TB​
PM1633a 15.36 TB​
Samsung proprietary controller​
Samsung's 512 Gb
64-layer TLC NAND​
Samsung's 256 Gb
48-layer TLC NAND​
DRAM Cache
Sequential Read
2100 MB/s​
1200 MB/s​
Sequential Write
1700 MB/s​
Random Read 4KB
Random Write 4KB
1 DWPD (Drive Write Per Day)
56 PB over 5 years​
28 PB over 5 years​
Interface and Form-Factor
2.5"/15mm SAS-12 Gbps​

Samsung started mass production of its PM1643 SSDs in January and has already shipped the first batch to an undisclosed customer. Pricing of individual 30.72 TB drives remains unknown, but we expect it to be thousands of dollars per unit, even at bulk. Later this year Samsung plans to introduce additional capacity points to the PM1643 lineup: the family will include drives featuring 15.36 TB, 7.68 TB, 3.84 TB, 1.92 TB, 960 GB and 800 GB of usable NAND flash.

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