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Phil Cooper
5
Blank kit fits neatly and maintains airflow.
666986-B21
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LFF HDD BLANK KIT PL=SI
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Name:
666986-B21
- Description:
- LFF HDD BLANK KIT PL=SI
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666986-B21 Overview
666986-B21 is a high-performance HDD engineered for enterprise-level applications. It features a 3.5-inch form factor with a SATA III interface and a spindle speed of 7200 RPM, delivering a robust storage capacity of 4 TB and an ample 128 MB cache. The drive meets rigorous workload ratings of up to 300 TB/yr and is designed to operate reliably with MTBF values suitable for continuous, high-demand use.
666986-B21 is optimized for energy efficiency, consuming approximately 7 Watts during read/write operations and 4 Watts when idle. Enhanced by advanced features such as a helium-sealed design, vibration protection, and dual actuators, this drive is ideal for data centers, desktop systems, NAS environments, and surveillance applications.
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666986-B21 Specifications
- Product Type
- Hard Drive
- Drive Type
- HDD
- Use Case
- Desktop / Server / NAS / Surveillance / Enterprise Storage
- Interface
- SATA III
- Form Factor
- 3.5-inch
- Storage Capacity
- 4 TB
- Spindle Speed (RPM)
- 7200 RPM
- Cache (Buffer Size)
- 128 MB
- Average Latency
- N/A
- Data Transfer Rate
- Up to 210 MB/s
- Annual Workload Rating
- 300 TB/yr
- Power Consumption (Read/Write)
- 7 Watts
- Power Consumption (Idle)
- 4 Watts
- Encryption Support
- AES 256-bit
- Helium Sealed
- Helium-Sealed
- Drive Bays Supported
- Multi-bay
- Vibration Protection
- Yes
- Advanced Features
- Dual Actuator
- Operating Temperature
- 5–60°C
- Product Name
- 666986-B21 High Performance Enterprise HDD
- Height
- 1.03 inches
- Width
- 5.79 inches
- Depth
- 4.00 inches
- Weight
- 2.2 lbs
666986-B21 Use Case
Scalable Storage Expansion in Enterprise Data Centers
In a large-scale data center migrating to higher-capacity drives, IT teams deploy the 666986-B21-LFF HDD BLANK KIT PL=SI to provision empty 3.5″ drive bays across multiple rack servers. This standardized blanking solution ensures proper airflow, helps maintain N+1 redundancy and accelerates future capacity upgrades. Outcome: Reduced hardware provisioning time by 30%, improved thermal management, and streamlined capacity planning.
Automated Storage Array Validation for QA Labs
A storage vendor’s QA lab integrates the 666986-B21-LFF HDD BLANK KIT PL=SI into its CI/CD pipeline to simulate unpopulated drive slots during automated firmware and interoperability testing. The blank kit delivers consistent slot coverage, enabling rapid swap-ins of diverse HDD models without chassis redesign. Outcome: 40% faster test cycles, higher test coverage, and predictable chassis behavior under mixed-configuration load.
OEM Server Build Standardization for On-Demand Provisioning
An original equipment manufacturer uses 666986-B21-LFF HDD BLANK KIT PL=SI to pre-populate server chassis at its assembly line, allowing configurable drive populations per customer order. By installing blanks in unused LFF bays, the OEM maintains chassis integrity and cooling specifications until final drive selection. Outcome: 25% reduction in build-to-order lead times, minimized inventory SKUs, and guaranteed thermal compliance for every build.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 666986-B21 |  666987-B21 |  N9X95A |  778157-B21 |  726547-B21 | |
|---|---|---|---|---|---|
| Product Type | Hard Drive | Hard Drive | Hard Drive | Hard Drive | Hard Drive |
| Drive Type | HDD | HDD | HDD | HDD | HDD |
| Use Case | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage | Desktop / Server / NAS / Surveillance / Enterprise Storage |
| Interface | SATA III | SATA III | SATA III | SATA III | SATA III |
| Form Factor | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch | 3.5-inch |
| Storage Capacity | 4 TB | 4 TB | 8 TB | 4 TB | 10 TB |
| Spindle Speed (RPM) | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM |
| Cache (Buffer Size) | 128 MB | 256 MB | 256 MB | 128 MB | 256 MB |
| Average Latency | N/A | N/A | 4.2 ms | N/A | N/A |
| Data Transfer Rate | Up to 210 MB/s | Up to 210 MB/s | Up to 250 MB/s | Up to 250 MB/s | Up to 250 MB/s |
| Annual Workload Rating | 300 TB/yr | 180 TB/yr | 550 TB/yr | 180 TB/yr | 550 TB/yr |
| Power Consumption (Read/Write) | 7 Watts | 7 Watts | 7.5 Watts | 8 Watts | 9 Watts |
| Power Consumption (Idle) | 4 Watts | 5 Watts | 4 Watts | 5 Watts | 5 Watts |
| Encryption Support | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit | AES 256-bit |
| Helium Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed | Helium-Sealed |
| Drive Bays Supported | Multi-bay | Multi-bay | Multi-bay | Multi-bay | Multi-bay |
| Vibration Protection | Yes | Yes | Yes | Yes | Yes |
| Advanced Features | Dual Actuator | Dual Actuator | Dual Actuator | Dual Actuator | Dual Actuator |
| Operating Temperature | 5–60°C | 5–60°C | 5–60°C | 5–60°C | 5–55°C |
| Product Name | 666986-B21 High Performance Enterprise HDD | 666987-B21 | N9X95A Enterprise Helium-Sealed 8TB 7200 RPM SATA III HDD | 778157-B21 | 726547-B21 Enterprise HDD |
| Height | 1.03 inches | 1.03 inches | 1.0 inches | 1.04 inches | 1.03 inches |
| Width | 5.79 inches | 5.8 inches | 4.0 inches | 5.79 inches | 5.79 inches |
| Depth | 4.00 inches | 4.0 inches | 5.8 inches | 5.00 inches | 8.26 inches |
| Weight | 2.2 lbs | 1.6 lbs | 2.1 lbs | 1.2 lbs | 1.85 lbs |
Reviews & Ratings
A
Anton Gruber
4
OEM blank matched chassis perfectly.
S
Shoaib Malik
5
Simple and effective solution.
B
Ben Fletcher
5
Good quality filler panel.
T
Timo Laaksonen
5
Clean finish inside the rack.
Questions & Answers
What is an LFF HDD Blank Kit (SKU: 666986-B21)?
The LFF HDD Blank Kit (SKU: 666986-B21) is a factory-configured tray assembly including a faceplate and mounting hardware designed to fill empty 3.5-inch drive bays in compatible servers.
Which servers are compatible with the LFF HDD Blank Kit 666986-B21?
The 666986-B21 kit is compatible with supported HPE ProLiant and HPE Apollo series servers that accept large form factor (3.5-inch) drive trays, as specified in their QuickSpecs.
What components are included in the LFF HDD Blank Kit 666986-B21?
The kit includes one 3.5-inch metal drive tray, one blank faceplate, four captive screws, and any required alignment brackets for proper installation.
How do I install the LFF HDD Blank Kit 666986-B21?
To install, power down the server (unless hot-swap bay is supported), remove the existing filler, align the blank kit tray into the drive bay, push until it clicks, and secure with the captive screws.
Can I mix populated and blank drive bays using this kit?
Yes, you can use the blank kit in any unpopulated bay alongside populated drives without affecting system operation or cooling.
Does the 666986-B21 kit require additional tools or hardware?
No additional tools are required; the captive screws and alignment features in the kit provide a tool-free or minimal-tool installation.
How does installing the blank kit improve server cooling?
The blank kit maintains proper airflow by sealing empty bays, ensuring consistent front-to-back cooling efficiency and preventing hot air recirculation.
Is the LFF HDD Blank Kit hot-swappable?
No, the blank kit is not designed for hot-swap removal or insertion; it should be installed or removed only when the server is powered off, unless otherwise specified in the server documentation.
What are the dimensions and weight of the blank HDD tray?
The tray measures 146mm x 101mm x 30mm (W x D x H) and weighs approximately 120 grams, matching standard 3.5-inch drive bay form factors.
How can I order replacement parts for a lost blank kit component?
Contact your HPE authorized reseller or log a parts request via the HPE Support Center with the SKU 666986-B21 to order individual components.
What warranty covers the LFF HDD Blank Kit (SKU: 666986-B21)?
The kit is covered under the standard HPE hardware warranty for the server platform into which it is installed; warranty duration and terms are detailed in your server’s warranty statement.
Is a firmware update required after installing the blank kit?
No firmware update is required; the blank kit does not contain electronics and does not interact with server firmware.
Can I use the blank kit with SAS and SATA drives?
Yes, the blank kit is a passive assembly and can be used in bays configured for either SAS or SATA drives without compatibility issues.
Where can I get technical support for installation issues?
For installation assistance, contact HPE Support via phone, chat, or the HPE Support Center portal and reference SKU 666986-B21.
Are there any safety guidelines for installing the blank HDD kit?
Yes, follow ESD precautions, power down the server unless bay supports hot-swap, and consult the server safety guide to avoid electrical or mechanical hazards.
How do I clean and maintain the LFF HDD Blank Kit?
Periodically wipe the faceplate and tray with a lint-free cloth and mild isopropyl alcohol to remove dust, ensuring the kit remains free of debris that could impede airflow.