More NAND SSD in fewer hands as WD $20m Kioxia bid likely

by Joseph K. Clark

According to the Wall Street Journal, Western Digital is set to buy its Japanese rival Kioxia for $20m. Since the start of the year, rumors have circulated that Kioxia is set to be purchased by one of its competitors. Until recently, Micron was the suspected buyer. However, the merger of Kioxia and Western Digital appears more logical given the partnerships between the two companies, which see NAND SSD chips manufactured in a combined facility.

According to numbers from analysts TrendForce, Kioxia, and Western Digital are the second and third more important SSD makers, with 18.3% and 14.7% of the market, respectively. Number one is Samsung, with 34% of the market. Mathematically, combining the two challengers should put them at the same level as the market leader.

The Western Digital-Kioxia acquisition – deemed very likely by analysts – would follow the recent sale of Intel’s NAND flash activity to SK Hynix of South Korea for $9m. That acquisition allowed SK Hynix to get hold of 19% of the SSD market (12.3% + 6.7%) and rank second among the suppliers, but it will be back in third if Western Digital and Kioxia join forces.

Previously number four in the big six of NAND makers, Micron will prop up a new four-member league table with 9.8% of the market, behind Samsung, Western Digital plus Kioxia, and SK Hynix plus Intel’s NAND.

According to the most recent results, it is notable that SSD production formed only about a quarter of Micron’s activities. About three-quarters (73%) of its last quarter’s turnover came from sales of DRAM memory components.

Micron’s performance in the SSD market has been poor, notably due to its inability to supply large volumes to cloud hyperscalers. At the same time, it sells entry-level products to the general public.


Outside the big six/four, the smaller manufacturers (YMTC, etc.) represent 2.8% of the market in total. TrendForce points out that there is growth here, with a quarterly turnover augmenting at 48.6% year-on-year.

According to TrendForce, the latest quarterly numbers for the principal SSD suppliers are distributed thus:

  • Samsung: $5.59m quarterly turnover, representing a yearly growth of 12.5% and 8% more products sold.
  • Kioxia: $3.01m turnover, 8.5% revenue growth on 3% more products sold.
  • Western Digital: $2.42m turnover, 11.2% revenue growth on 4% more products sold.
  • SK Hynix: $2.02m turnover, 10.8% revenue growth on 3% more products sold.
  • Micron: $1.8m turnover, 9.8% revenue growth on 7% more products sold.
  • Intel: $1.01m turnovers, with a 0.8% decrease in revenue and a 10% drop in products sold.

Innovative moves ahead

Regarding technology, the suppliers plan some improvements over the coming months. First, they will all standardize on SSD NVME for the PCIe 4.0 bus, providing a throughput of 7GBps (across four channels), twice the capacity of PCIe 3.0.

Capacity will depend on the number of layers of NAND cells that the vendors can successfully achieve in manufacturing. Samsung is the most advanced, with chips that comprise 200 layers already, with 176 acquired by SK Hynix and Micron. Western Digital and Kioxia are limited to 162 layers though there are promises of 212 from the start of 2022.

SSDs will be available as “zoned namespace” products, among other innovations. In other words, with the ability to group data in zones dedicated to types of applications. Zoning like this is aimed at guaranteeing rapid SSD access and long lifespans. Western Digital is the most advanced; Samsung has promised to commercialize products by the end of the year, and Micron is likely to make announcements.

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