DatacenterDisk
WD

WD Ultrastar DC SN640 1.6TB U.2

WUS4CB016D7P3E4
Ultrastar DC SN6401.6TBNVMe-PCIe3U.2
$305.63/TB
$489.00
newIn Stock
Price updated
Price accurate as of Aug 9, 2026, 12:00 AM
Buy on Amazon →
Quick Verdict

The WD Ultrastar DC SN640 1.6TB U.2 delivers enterprise NVMe performance at $305.63/TB. Suited to read-intensive cloud workloads and mixed enterprise applications. Verify U.2/U.3 backplane compatibility before ordering.

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Specifications

Capacity1.6TB
Form FactorU.2
InterfaceNVMe-PCIe3
Recording Tech—
Sector Size—
Workload Rating—
DWPD2
TBW—
Warranty5 years
ASINB0HC7KXP82
Market context

Against every other drive we have an in-stock price for today, this one is cheaper per tb than 54% of them (14 of 26). The cheapest we can currently buy is $20.91/TB; the middle of the market is $341.81/TB.

Where the wider market has moved

These are third-party figures about the retail market as a whole, quoted and dated. They are not our own measurements and they do not describe this specific drive.

Compare against every 1.6TB drive we track →Cheapest per terabyte, all categories →Category price trends →

Frequently Asked Questions

The Ultrastar DC SN640 1.6TB U.2 is designed for mixed enterprise workloads including virtualization, databases and analytics. Rated 2 DWPD endurance.

The Ultrastar DC SN640 1.6TB U.2 uses a U.2 form factor with NVMe-PCIe3 interface. Compatible with servers featuring U.2 or U.3 backplanes including Dell PowerEdge, HPE ProLiant Gen10+, and Supermicro with appropriate NVMe backplane.

2 DWPD means you can write the full 1.6TB capacity 2 time(s) per day over the 5-year warranty period, totaling approximately 5840TB written.

Use Case Scenarios

🗄️
OLTP Database Primary Storage
PostgreSQL, MySQL or Oracle requiring low latency and high IOPS.
✓ Excellent fit
NVMe delivers sub-200μs latency vs 5ms for HDD — a 25x improvement that directly reduces query response times. At 1 DWPD verify your daily write volume stays within endurance limits.
🤖
AI/ML Training & Inference
GPU server loading training datasets or serving inference at high throughput.
✓ Excellent fit
NVMe at 6,900MB/s eliminates storage bottlenecks when loading datasets to GPU memory. Consider multiple drives for larger datasets.
💾
Bulk Cold Data Archive
Storing large volumes of infrequently accessed data.
✗ Not ideal
At ~$306/TB, NVMe costs 10x more than enterprise HDD for cold data. Unless you need fast retrieval, HDDs or LTO tape are far more cost-effective.

Maintenance & Troubleshooting

Maintenance Checklist

On installUpdate drive firmware
Check manufacturer website for latest firmware. Enterprise SSDs receive updates that fix performance and reliability issues.
On installEnable power loss protection verification
Enterprise NVMe drives have onboard capacitors for power loss protection. Verify in drive logs after first power cycle.
MonthlyCheck SMART/NVMe health attributes
Run nvme smart-log /dev/nvme0 (Linux). Monitor: Media_Errors, Available_Spare, Percentage_Used.
MonthlyMonitor write endurance consumption
Track Percentage_Used SMART attribute. At 80%+ consider planning replacement. At 1.6TB and 2 DWPD you have 5,980,160GB lifetime writes.
QuarterlyReview error logs in server BMC
Check iDRAC, iLO or IPMI logs for NVMe errors, PCIe link speed downgrades, or unexpected resets.

Troubleshooting Guide

Cause: PCIe slot not initialized, missing NVMe driver, BIOS not updated, or U.2 cable issue.
Fix: Check BIOS for NVMe in PCIe enumeration. Update server firmware. Reseat U.2 cable. Verify PCIe bifurcation if using adapter. Test in another slot.