WD Ultrastar DC SN640 Enterprise SSD - 3.84TB

Brand: Western Digital | Category: Enterprise SSDs

SKU: WDS384T1B0C | Part #: WDS384T1B0C | MPN: WDS384T1B0C

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Enterprise data centres operating mixed-workload storage architectures demand SSDs that can handle both sustained sequential throughput and aggressive random I/O bursts without sacrificing reliability or cost-efficiency. The WD Ultrastar DC SN640 3.84TB (part number WDS384T1B0C) sits squarely in the read-intensive caching and mixed-workload primary tier, where its 780,000 random read IOPS and 3,550 MB/s sequential read performance address the needs of database acceleration, analytics platforms, and virtualisation host caching layers. This positioning reflects how storage architects and enterprise infrastructure teams allocate budget: the SN640 trades some write performance for exceptional read throughput at a capacity point that fills the sweet spot between density and per-drive cost, making it the practical choice for organisations scaling their I/O-bound workloads across existing server infrastructure.

Built on Western Digital's 96-layer 3D TLC NAND process and paired with a PCIe Gen 3.1 x4 NVMe 1.3 interface, the Ultrastar DC SN640 delivers the kind of sustained performance that separates drives designed for enterprise use from consumer-grade alternatives. The 1,900 MB/s sequential write speed handles bulk data ingest and log aggregation without bottlenecking, while the 180,000 random write IOPS proves sufficient for transactional workloads that don't demand the extremes of high-end optane-based solutions. At 1 DWPD (drive writes per day), this drive is rated for environments where daily write volume stays within the single-digit terabyte range—typical of read-heavy analytics databases, cache layers serving machine learning inference pipelines, and content distribution networks. The capacitor-based power loss protection ensures that data in flight reaches the NAND safely if mains power fails, a non-negotiable requirement for systems handling financial transactions or time-series sensor data.

System integrators and storage architects appreciate the WD Ultrastar DC SN640 for its enterprise security and virtualisation-friendly feature set. The self-encrypting drive (SED) implementation supports both TCG Enterprise and TCG Opal standards, allowing organisations to meet compliance requirements without incurring the CPU overhead of software encryption stacks. Multi-namespace support and SR-IOV capability mean that hypervisor environments can carve the drive into isolated logical volumes, each with independent encryption keys and performance accounting—essential when a single physical server houses workloads from multiple business units. End-to-end data protection built into the drive firmware catches silent data corruption at the I/O boundary, reducing the probability that undetected bit errors propagate into application-level failures. With an MTBF rating of 2,000,000 hours and operating temperature tolerance from 0°C to 70°C, the SN640 remains stable whether deployed in a cooled data centre or in the warmer server rooms common in smaller branch locations.

The U.2 2.5-inch form factor (15mm) with SFF-8639 connector places the WD Ultrastar DC SN640 squarely in the server-centric ecosystem. Unlike SATA or 2.5-inch SAS drives, U.2 integrates directly with NVMe-capable server backplanes, eliminating adapter complexity and preserving the high-speed PCIe link without intermediate bridge chips. Typical power draw of approximately 8W during active operations keeps thermal load manageable even in dense blade chassis, where every watt matters in cost-per-IOPS calculations. The part number WDS384T1B0C appears consistently across OEM qualification lists for mainstream enterprise servers, meaning procurement teams face minimal delay in integration and driver support. Storage administrators tasked with refreshing caching tiers or expanding analytics clusters will find the SN640's capacity and performance balance familiar—it occupies the same niche that made the previous-generation DC SN840 popular before the shift toward Gen 4 and Gen 5 architectures began fragmenting the market.

Omnixon Global maintains active inventory of the WD Ultrastar DC SN640 3.84TB across our UAE and GCC distribution hubs, with direct supply lines supporting data centre buildouts, AI infrastructure expansion, and enterprise storage modernisation projects throughout the region and into South Asia. If your team is evaluating this drive for deployment or requires technical validation alongside other enterprise SSD candidates, we welcome your RFQ and can arrange sample testing at our Dubai facility. Contact our storage specialists to discuss volume pricing, lead times, and integration support.

Performance Specifications & Enterprise Positioning

• Sequential read throughput up to 3,550 MB/s with random read IOPS of 780,000, optimising read-intensive caching and mixed-workload primary storage tiers
• NVMe 1.3 over PCIe Gen 3.1 x4 interface delivering consistent latency for virtualised database and analytics workloads without adapter translation
• 96-layer 3D TLC NAND with 1 DWPD endurance rating and capacitor-backed power loss protection for mission-critical read-heavy environments
• Self-encrypting drive with TCG Enterprise and TCG Opal support, multi-namespace isolation, and SR-IOV capability for compliance-driven and multi-tenant deployments
• U.2 2.5-inch 15mm form factor with SFF-8639 connector for direct integration into enterprise server backplanes without bridge chips or adapter overhead
• MTBF of 2,000,000 hours and operating temperature range 0–70°C, ensuring reliability across diverse data centre and branch office thermal profiles
• End-to-end data protection and typical active power consumption of 8W, balancing performance density with thermal and power budget constraints in production clusters