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Western Digital Ultrastar DC SN655 U.3 7.68 TB PCI Express 4.0 TLC 3D NAND NVMe, Model 0TS2459
- Storage Capacity: 7.68 TB capacity for high-volume data storage applications
- PCI Express 4.0: PCI Express 4.0 interface specification for compatible computer systems
- NAND Type: TLC 3D NAND technology listed for the Ultrastar DC SN655
- NVMe Interface: NVMe storage protocol with a U.3 connection
- DRAM Cache: DRAM cache supports the listed storage architecture
- Product Model: Western Digital model 0TS2459 for variant identification
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Overview
Specs
Reviews
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Overview
The Western Digital Ultrastar DC SN655 is a computer accessory with 7.68 TB capacity, a U.3 connection, PCI Express 4.0, TLC 3D NAND, and NVMe. Model 0TS2459 identifies this product variant.
Key Features
- 7.68 TB storage capacity
- U.3 connection
- PCI Express 4.0
- TLC 3D NAND
- NVMe
- DRAM cache
Performance
The listed storage configuration provides 7.68 TB capacity and uses PCI Express 4.0 with NVMe. No speed or throughput rating is provided in the supplied specifications.
Design
The listed dimensions are height 0.320 and width 4.200, with a listed weight of 0.3527. Units are not specified in the source information.
Connectivity & Compatibility
The product is listed with a U.3 connection, PCI Express 4.0, and NVMe. Compatibility with specific computer systems or operating systems is not provided.
Specifications
- Brand: Western Digital
- Product: Ultrastar DC SN655
- Model: 0TS2459
- Device Type: Computer Accessories
- Capacity: 7.68 TB
- Connection: U.3
- Interface: PCI Express 4.0
- Protocol: NVMe
- NAND: TLC 3D NAND
- Cache: DRAM
- Height: 0.320
- Width: 4.200
- Weight: 0.3527
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 5 years
- Limited Warranty period (labor): 5 years
- Read full details
Return Policies
- Return for refund until: January 31, 2026
- Return for replacement until: January 31, 2026
- This item is covered by Newegg.com's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2025 and December 31, 2025 you will have until January 31, 2026 to return your product.
Manufacturer Contact Info
- Manufacturer Website
- Support Phone: 1-800-275-4932
- Support Website
- View other products from Western Digital
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The Western Digital Ultrastar DC SN655 is a 7.68 TB U.3 NVMe SSD with a PCIe 4.0 interface, TLC 3D NAND, and DRAM cache, suited to servers and storage systems that support U.3 and need high-capacity internal storage.
Recommended For
- Cloud and enterprise server operators consolidating read-intensive data on high-capacity NVMe storage can use the 7.68TB SN655 in systems built for U.3 or compatible U.2 NVMe drives.
- Operators of storage arrays that need dual-port access and failover can consider the SN655 for designs that use those enterprise features.
- Teams running virtualized storage clusters can evaluate the SN655 for shared enterprise workloads; StorageReview tested the drive in VMware vSAN ESA server configurations.
- Data-center teams handling analytics or machine-learning datasets can consider it when their workload benefits from high-capacity, PCIe Gen4 NVMe storage and fits the drive’s read-intensive positioning.
Real-World Use Scenarios
- In a compatible VMware vSAN 8 ESA cluster, administrators can use SN655 drives as shared flash storage for virtual machines; StorageReview’s multi-server test found that adding drives increased cluster throughput, with gains eventually limited by the wider system.
- For a virtual desktop infrastructure deployment, the SN655 can serve as high-capacity flash storage for many virtual desktops, helping keep desktop workloads on a shared, server-based storage pool rather than separate local drives.
- In a virtualized environment running databases alongside less latency-sensitive applications, an administrator can place the busiest database virtual disks on a higher-performance storage policy and use a capacity-oriented policy for other data; the drive itself does not determine the policy or guarantee database response times.
- For analytics or AI/ML servers that repeatedly access large datasets, the SN655 can provide a dense NVMe storage tier; the practical benefit is keeping more working data on flash and reducing storage-side waits when the rest of the system can use the drive’s throughput.
- At an edge, retail, or remote-office site, a server built for U.3 NVMe can use the SN655 to add high-capacity local flash without relying on a large number of separate drives; confirm the server’s drive-bay and controller compatibility before deployment.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Internal high-capacity SSD storage for PC and Linux systems |
| Capacity | 7.68 TB (7,680 GB) of solid-state storage |
| Interface And Configuration | PCIe x4 NVMe interface with DRAM cache |
| Read Write Performance | Sequential read up to 6.8 GB/s and sequential write up to 2 GB/s; up to 980,000 random read IOPS and 80,000 random write IOPS |
| Model Identifiers | Western Digital Ultrastar DC SN655; model 0TS2459, model number WUS5EA176ESP7E1 |