Curtis Stevens of Seagate Technology presents drive regeneration techniques at OCP Global Summit 2025, arguing that single-head failures — the dominant real failure mode in modern 20-head HDDs — can be resolved without replacing the drive. Using Storage Element Depopulation, a drive can be reprovisioned at 95% capacity after a head failure, stopping approximately 95% of cell service visits and eliminating weeks-to-months of downtime. The talk covers existing SMR-based zoned depopulation, three proposed approaches to extend the technique to conventional CMR drives, and a novel drive-managed Optimized Provisioning approach that could extend HDD useful life from 4 to 6-7 years.

Key Takeaways

• Typical enterprise data centers run with approximately 5% of drives nonfunctional at any time; drive regeneration via Storage Element Depopulation can convert most of those non-functional drives back into working capacity without new hardware.
• Storage element depopulation is standardized and Linux-supported today: CMR uses Remove Element and Truncate (full reformat, 95% capacity); SMR uses Remove Element and Modify Zones (data-safe, no downtime, no format required).
• The LBA Status Log feature, currently in ecosystem development, enables proactive identification of degrading LBAs before complete head failure, providing a path for host-managed data relocation.
• Three proposed approaches extend depopulation to CMR drives: CMR Zones (~7% average LBA loss), LBA Status Log host-relocation (~5% LBA loss but millions of remap entries), and drive-managed Optimized Provisioning (host-transparent but adds SSD-like LBA mapping).
• Sealed datacenters — fully enclosed, potentially underwater deployments — have a strong need for drive regeneration since physical service is impossible, making remote-operable fault tolerance essential.
• Single-head failures represent 40%+ of actual drive failures; with 20 heads per modern HDD, one head failure affects only 5% of the media, making 95% of the drive's capacity salvageable via depopulation.