Seagate’s Exos 4U100 JBOD enclosure shown here is essentially a 4U storage brick that packs up to 100 Mozaic HAMR hard drives, reaching 3.2 petabytes in a single tray when populated with 32TB disks. It targets AI backends, data lakes and large backup repositories where cost per terabyte, rack density and power per petabyte really matter. https://www.seagate.com/products/storage/data-storage-systems/jbod/exos-4u74-and-4u100/
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Torsten Konrad explains how the enclosure is engineered around power and cooling rather than just raw drive count. Front-to-back airflow is guided through the main chamber and also under the drive plane so every slot receives fresh air, yielding up to 70% better thermal efficiency and around 30% lower power than legacy enclosures. The system uses SAS-4 (24G SAS), delivering up to 24 GB/s aggregate bandwidth while still letting you treat it as a simple, high-density JBOD from the host point of view.
Filmed at Supercomputing 2025 (SC25) in St. Louis, the video also dives into practical deployment details that matter to data center operators. The Exos 4U100 is available in 1.0 m and 1.2 m chassis depths to match different rack standards, with internal rails so the whole unit slides onto a shelf without fiddly rail alignment. Internal cable management keeps SAS cabling inside the rack envelope, and because the system uses built-in carriers you can slot bare 3.5″ drives directly without extra hardware, simplifying service and drive swaps.
Logically it’s “just a bunch of disks,” but in modern architectures the JBOD becomes the capacity tier behind software-defined storage running on front-end servers. Erasure coding or RAID lives in the software layer, while this enclosure focuses on density, airflow, vibration damping and predictable thermals for 100 spinning disks. For AI workloads the first tier is typically HBM and NVMe flash feeding GPUs, with HDD-based tiers like Exos 4U100 holding cold and warm data, training corpora, model checkpoints and long-term logs at roughly one-fifth the cost per terabyte of flash.
Seagate’s Mozaic HAMR roadmap pushes capacity beyond today’s 32TB drives toward 40TB, 50TB and higher, and the 4U100/4U74 enclosures are explicitly designed to accommodate those future disks so petabytes per rack can keep scaling without changing the chassis. That makes a single 42U rack with up to ten of these trays a 32-petabyte building block for AI, edge and sovereign data infrastructures. Hardware root-of-trust, secure boot on the BMC and standards-based management interfaces are included to meet tightening EU and US regulatory requirements around storage security in large-scale environments.
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