695510-S21 HPE 4TB SAS 6GBPS 7.2K RPM LFF SC Tray HDD.

HPE 695510-S21 4TB SAS 6Gbps 7.2K RPM Hard Drive Overview

The HPE 695510-S21 4TB SAS hard disk drive is a high-reliability enterprise storage solution designed for mission-critical server environments. Built for scalability and consistent performance, this large form factor (LFF) hot-swap drive delivers dependable data handling for modern data centers, virtualized infrastructures, and high-capacity storage systems.

General Product Specifications

• Manufacturer: HPE
• Part Number: 695510-S21
• Device Type: Enterprise Hard Disk Drive
• Category: Midline Storage Solution

Physical and Design Characteristics

• Form Factor: 3.5-inch Large Form Factor (LFF)
• Drive Type: Hot-swappable enterprise HDD
• Carrier Type: HPE Smart Carrier (SC)
• Installation: Tool-less server bay compatibility

Storage Capacity and Interface

• Storage Capacity: 4 Terabytes (TB)
• Interface Type: Serial Attached SCSI (SAS)
• Interface Speed: 6Gbps bandwidth support
• External Transfer Rate: Up to 600 Mbps
• Sector Size: 512 bytes per sector

Speed and Processing Performance

• Rotational Speed: 7200 RPM (7.2K)
• Optimized for steady workload environments
• Balanced throughput for read/write operations
• Reliable latency performance for enterprise systems

Hot-Swap Functionality

• Allows drive replacement without shutting down servers
• Minimizes system downtime in production environments
• Supports seamless maintenance and upgrades

Midline Storage Optimization

• Ideal for bulk storage and archival data
• Cost-effective balance between performance and capacity
• Designed for read-intensive and mixed workloads

Connectivity and Compatibility

Interface and Expansion Support

• Single SAS 6Gbps interface connection
• Compatible with enterprise-grade HPE servers
• Supports 3.5-inch LFF drive bays
• Designed for scalable storage environments

System Integration Compatibility

• Works with HPE ProLiant server systems
• Supports storage arrays and RAID configurations
• Optimized for virtualization and cloud infrastructure

Use Cases and Applications

Enterprise Data Storage

• Large-scale database storage systems
• Backup and disaster recovery solutions
• Centralized file storage in data centers

Virtualization and Cloud Infrastructure

• Supports virtual machine storage pools
• Reliable performance for cloud hosting environments
• Efficient workload distribution across servers

Archival and Media Storage

• Long-term data retention systems
• Media libraries and content repositories
• Compliance and regulatory storage needs

Performance Advantages of HPE 695510-S21

Stability and Endurance

• Engineered for continuous 24/7 operation
• Reduced risk of data loss in enterprise environments
• Strong mechanical durability for long service life

Efficiency and Cost Optimization

• Lower cost per terabyte compared to high-performance SSDs
• Energy-efficient midline drive design
• Optimized for high-capacity storage at scale

HPE 695510-S21 4TB SAS 6Gbps 7.2K RPM Hard Drive

The HPE 695510-S21 4TB SAS 6Gbps 7.2K RPM Dual Port LFF SC Tray Hard Drive is designed as a high-capacity enterprise storage solution built for reliability, scalability, and consistent performance in mission-critical server environments. Engineered within the Hewlett Packard Enterprise storage ecosystem, this drive belongs to a class of large form factor (LFF) hard drives optimized for data centers, virtualization workloads, and high-availability systems requiring sustained data throughput and resilient architecture. The integration of SAS interface technology at 6Gbps ensures stable communication between storage controllers and disk units, enabling enterprise systems to maintain predictable performance under demanding workloads.

As organizations continue to generate massive volumes of structured and unstructured data, storage components like the HPE 695510-S21 play a vital role in ensuring that infrastructure can scale without compromising reliability. This drive is widely implemented in rack servers and storage arrays where high-capacity spinning disks are still preferred for cost-efficient bulk storage, backup repositories, archival systems, and hybrid storage configurations combining SSD speed with HDD affordability.

Enterprise Storage Architecture

Large Form Factor Engineering and Mechanical Stability

The large form factor design of this 4TB hard drive is intended to maximize storage density per bay while maintaining mechanical stability during continuous operation. The 3.5-inch chassis provides space for robust internal components including high-capacity platters, reinforced spindle assemblies, and vibration-resistant mounting structures. These engineering choices ensure consistent rotational accuracy at 7,200 RPM, which is essential for maintaining predictable read and write latency in enterprise workloads.

The structural integrity of the LFF design also supports better thermal distribution compared to smaller drives in certain dense storage environments. By distributing heat more evenly across the enclosure, the drive helps maintain optimal operating conditions within multi-drive server chassis configurations.

Dual Port SAS Connectivity Architecture

One of the most critical features of the HPE 695510-S21 is its dual port SAS interface design. Dual porting enables redundant data paths between the drive and storage controller, significantly improving fault tolerance and system availability. In enterprise environments where uptime is essential, this redundancy ensures that if one data path becomes unavailable, the secondary path can continue transmitting data without interruption.

The SAS 6Gbps interface supports reliable full-duplex communication, allowing simultaneous read and write operations with minimal contention. This makes it particularly suitable for RAID configurations where multiple drives operate together to deliver redundancy and improved performance. The architecture also enhances scalability in storage systems, allowing administrators to expand arrays without disrupting ongoing operations.

Performance Characteristics and Workload Suitability

7.2K RPM Spindle Speed Efficiency

The 7,200 RPM rotational speed provides a balanced performance profile suitable for bulk storage applications. While not designed for ultra-high-speed transactional workloads, it delivers steady throughput for sequential data operations such as backups, media storage, and large-scale file repositories. This speed class is widely used in enterprise environments where capacity and cost efficiency are prioritized over extreme IOPS performance.

The mechanical design ensures stable platter rotation with minimal vibration, which is essential for maintaining data integrity during continuous operation. Combined with firmware-level optimizations, the drive is capable of maintaining consistent latency across extended workloads.

4TB Storage Capacity Utilization

With a native capacity of 4 terabytes, this drive supports extensive data retention requirements for enterprise systems. It is commonly deployed in environments that require long-term storage of backups, virtual machine images, log files, and large datasets. The capacity is optimized for use in RAID arrays, where multiple drives work together to deliver scalable storage pools that can grow as organizational data demands increase.

The high-capacity design reduces the need for excessive drive counts in storage arrays, improving rack efficiency and simplifying infrastructure management. This contributes to reduced power consumption and lower operational complexity in data center environments.

Sequential Throughput Optimization

The drive is optimized for sequential read and write operations, which are common in backup and archival workflows. The firmware ensures that data is written in a structured manner across the platters, minimizing fragmentation and improving retrieval efficiency over time. This is particularly beneficial in systems that handle large file transfers or continuous data streaming.

Compatibility and Integration in HPE Ecosystems

Smart Carrier Tray Integration

The Smart Carrier (SC) tray design is a key component of this drive’s integration into HPE server systems. The tray enables tool-less installation and removal, simplifying maintenance and replacement operations in enterprise environments. It also provides status indicators that help administrators quickly assess drive health and operational status without accessing system-level diagnostics.

The SC tray enhances hot-plug capability, allowing drives to be replaced or upgraded without shutting down the entire system. This is particularly valuable in mission-critical environments where downtime must be minimized.

Server and Storage Array Compatibility

This drive is compatible with a wide range of HPE ProLiant servers and storage solutions designed to support SAS-based storage architectures. It integrates seamlessly into RAID configurations, supporting multiple RAID levels depending on controller capabilities. This flexibility allows organizations to configure storage systems according to their specific performance, redundancy, and capacity requirements.