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The new series uses Shingled Magnetic Recording (SMR) technology to deliver storage capacities[2] ranging from 30 to 34 TB[3]. Sample shipments have begun and Toshiba also plans to begin sample shipments of M12 drives that use Conventional Magnetic Recording (CMR) to deliver capacities of up to 28 TB in the third quarter of 2026.
Today is World Backup Day, the annual international initiative to remind companies and individuals of the importance of backing up and protecting their data. That need is now greater than ever, as the constant expansion of digital services and video content distribution, the widespread adoption of cloud services, and, most recently, the increasing use of data-hungry AI and data science, are driving forward immense growth in the volumes of data generated and stored worldwide.
The requirement from data centers, the repositories for most of the world’s digital data, is for higher-capacity, better-performing HDDs to support more efficient system configurations. The M12 Series is designed to address this demand by significantly increasing storage capacity in the standard 3.5-inch nearline HDD form factor.
M12 Series drives leverage Toshiba’s proprietary design and analysis technologies cultivated through the development of slim and compact products. They surpass previous generations (CMR MG11 and SMR MA11 Series) by incorporating an additional magnetic disk, for a total of 11 disks. Additionally, the recording media used in the M12 Series replaces the usual aluminium substrate with glass, which offers higher durability and enables a thinner design. Their enclosures are helium-filled, and the drives combine Toshiba’s proprietary Flux Control Microwave-Assisted Magnetic Recording (FC‑MAMR™) technology with SMR, achieving storage capacities of 30 to 34 TB.
SMR technology increases recording density by overlapping data tracks in a manner similar to roof shingles. However, because of the data track overlap, random write operations can result in performance degradation. The M12 Series HDDs adopt a host-managed SMR architecture, in which the host system manages data placement and rewriting within the drive. This approach enables more efficient data handling and reduces performance degradation in server and storage system environments.
The new SMR HDDs reach a maximum data transfer rate of 282 MiB/s[4], an improvement of approximately 8 %, while power consumption per terabyte (W/TB) is approximately 18 % lower than that of the previous generation of products. Designed for continuous 24/7 operation, the M12 Series supports an annual workload[5] rating of 550 TB and offers an MTTF/MTBF[6] of 2.5 million hours, an annualized failure rate (AFR) of 0.35 %.
Looking ahead, Toshiba plans to further increase HDD capacity through the adoption of next-generation recording technologies, including Heat Assisted Magnetic Recording (HAMR), and products featuring a 12-disk configuration[7]. Increasing HDD capacity is key to addressing the constantly growing storage demands of data centers.
[1] "3.5-inch" means the form factor of HDDs, and is not the HDD’s physical size.
[2] Range of storage capacity with variable capacity formatting applied.
[3] Definition of capacity: One terabyte (TB) = one trillion bytes, but actually available storage capacity may vary, depending on operating environment and formatting. Available storage capacity (including examples of various media files) will vary based on file size, formatting, settings, software and operating system and/or pre-installed software applications, or media content. Actual formatted capacity may vary.
[4] Read and write speeds may vary depending on the host device, read and write conditions, and file size.
[5] Workload is a measure of data throughput in a year, and it is defined as the amount of data written, read or verified by commands from the host system.
[6] MTTF/MTBF (mean time to failure/mean time between failure) is not a guarantee or estimate of the product life; rather it is a statistical value related to mean failure rates for a large number of products which may not accurately reflect actual operation. The actual product life of the product may vary.
[7] "Toshiba First in Industry to Verify 12-Disk Stacking Technology for Hard Disk Drives" announced on October 14, 2025.
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