WD Ultrastar DC HC580 | 24Disque dur d'entreprise TB ePMR SATA

24TB 的快乐与代价：大容量时代的三个现实

采购单上写 24TB 很容易，但每个容量翻倍都带来三个必须正视的现实：单盘故障影响翻倍、重建时间翻倍、盘位利用率决定每 TB 成本。WD Ultrastar DC HC580 是 2023 年底量产的 24TB CMR 企业盘（ePMR + OptiNAND 技术），它存在的意义不是\”更大\”，而是把大容量时代的可靠性账算清楚——这正是数据中心存储团队真正关心的。

Spécifications de base

ePMR + OptiNAND: How 24TB Stays Reliable

HC580 pairs two Western Digital technologies: ePMR (energy-assisted perpendicular magnetic recording) extends areal density on each platter to reach 24TB of CMR capacity – no shingled writes, so random-write behavior stays classic; et OptiNAND integrates a flash co-processor with the drive\’s own error-recovery table, offloading metadata work from the HDD to NAND. The result: higher sustained throughput (jusqu'à 298 Mo/s) and better robustness during error recovery – the drive recovers without the long retry pauses that stall a rebuild.

Reliability Numbers That Matter at Scale

• MTBF 2.5 million hours (projected) – the Ultrastar-class reliability bar, avec un 550 TB/year workload rating covering sustained data-center duty.
• CMR, not SMR – random writes behave normally; the drive works in any array without shingling caveats.
• 512e with OptiNAND error recovery – fewer long retries means predictable rebuild times across a fleet.
• Helium-sealed – lower drag and stable internal pressure for consistent performance over life.

For comparison, le Toshiba MG10ACA20TE (20TB) is the density-stepped alternative; HC580\’s ePMR/OptiNAND brings the extra 4TB per drive at the same 3.5-inch bay.

Deploying 24TB Drives: The Rebuild Reality

In a 44-bay storage node like the xFusion 5288 V7, 44 x 24TB HC580 drives deliver 1.06 PB raw per node. But bigger drives rebuild slower: replacing a failed 24TB OSD moves ~24TB of data across the backend fabric. Plan for it:

• Size the backend network for recovery traffic (25/100Porter, dedicated fabric – voir notre distributed storage guide).
• Keep spare OSD slots budgeted – rebuilds are the new normal at this capacity point.
• Use erasure coding or replicas with rack-aware placement so one failed drive does not cascade.
• Monitor drive health telemetry (SMART + iBMC per-bay temperature) rather than waiting for failures.

FAQ sur l'achat

• CMR or SMR? Full CMR – no shingling, classic random-write behavior.
• Interface? SATA 6Gb/s, 512e (SAS and SED variants available in the family).
• Workload fit? Stockage d'objets, big data, backup/archive – 550 TB/year rated.
• Power draw? Helium-sealed efficiency at the 24TB class; request exact figures with your build.
• garantie? 5-year limited warranty on the Ultrastar line.

Density Math: 24TB vs 20TB per Rack

The extra 4TB per bay compounds across a cluster: +20% capacity at the same rack footprint, power and bay count – the classic density trade where the per-drive premium pays back in floor space.

Building a 1PB+ storage tier? As an authorized distributor we supply the HC580 with 5288 V7 storage nodes, matching cables and cluster design – prix compétitif, 3-an de garantie, global shipping and free consultation from our partner team. Contact us for a per-TB density quote.