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WD

Ultrastar DC SN655 15.36TB U.3

WUS5EA1A1ESP7E1
Ultrastar DC SN655oltpTLC15.36TBNVMe-PCIe4U.3
$123.63/TB
$1,899.00
newIn Stock
Updated Mar 22, 2026, 06:01 PM
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Quick Verdict

The WD Ultrastar DC SN655 15.36TB U.3 delivers enterprise NVMe performance at $123.63/TB. Suited to read-intensive cloud workloads and mixed enterprise applications. Verify U.2/U.3 backplane compatibility before ordering.

Specifications

Capacity15.36TB
Form FactorU.3
InterfaceNVMe-PCIe4
Recording TechTLC
Sector Size—
Workload Rating—
DWPD1
TBW28032TB
Warranty5 years
ASINB0D7X2Z542

90-Day Price History

$117$124$13003/2304/2906/04
How it compares - 15.36TB NVMe-PCIe4
#1Solidigm D5-P5316 15.36TB NVMe U.2
$117.19/TB
#2WD Ultrastar DC SN655 15.36TB U.3
$123.63/TB
#3WD Ultrastar DC SN655 15.36TB U.3THIS DRIVE
$123.63/TB
#4Seagate Nytro 5060 E3.S 15.36TB
$245.30/TB

Compare to similar 15.36TB NVMe-PCIe4 drives

Solidigm
D5-P5316 15.36TB NVMe U.2
$117.19/TB
$1,800.00
new
WD
Ultrastar DC SN655 15.36TB U.3
$123.63/TB
$1,899.00
new
Seagate
Nytro 5060 E3.S 15.36TB
$245.30/TB
$3,767.76
new

Frequently Asked Questions

The Ultrastar DC SN655 15.36TB U.3 is designed for mixed enterprise workloads including virtualization, databases and analytics. Rated 1 DWPD endurance.

The Ultrastar DC SN655 15.36TB U.3 uses a U.3 form factor with NVMe-PCIe4 interface. Compatible with servers featuring U.2 or U.3 backplanes including Dell PowerEdge, HPE ProLiant Gen10+, and Supermicro with appropriate NVMe backplane.

1 DWPD means you can write the full 15.36TB capacity 1 time(s) per day over the 5-year warranty period, totaling approximately 28032TB 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. At 15.36TB you can store substantial model weights on a single drive.
💾
Bulk Cold Data Archive
Storing large volumes of infrequently accessed data.
✗ Not ideal
At ~$124/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 15.36TB and 1 DWPD you have 28,704,768GB 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.