HPE 4TB 7.2K 3.5 inch SAS Midline Hard Drive (778551-001)

Server storage expansion often hits a wall: you need more capacity without sacrificing reliability or performance. The HPE 4TB SAS Midline Hard Drive solves that by delivering 4TB of enterprise-grade storage in a 3.5-inch form factor, engineered for always-on ProLiant environments. With a 6Gb/s SAS interface and 7200 RPM spindle speed, it balances cost-effective capacity with dependable throughput for business-critical data.

Who is it for

This drive is built for IT administrators and data center operators who need high-capacity, hot-swappable storage for HPE ProLiant servers. It suits workloads like file servers, backup targets, and archival storage where large volumes of data must remain accessible with predictable performance.

Main features

• 4TB storage capacity in a 3.5-inch Large Form Factor (LFF) drive
• Dual-port SAS 6Gb/s interface for redundant paths and high availability
• 7200 RPM spindle speed with 128 MB buffer for consistent performance
• Midline (MDL) drive class with digitally signed firmware for secure operation
• 512e Advanced Format sector technology for compatibility with modern systems
• Hot-swap capable for quick replacement without downtime
• 1.2 million hours MTBF for enterprise reliability

Specifications

• Brand: HPE
• Model: 778551-001
• Product Type: Hard Drive (HDD)
• Storage Capacity: 4 TB
• Interface: SAS 6Gb/s
• Spindle Speed: 7200 RPM
• Form Factor: 3.5-inch LFF
• Buffer Size: 128 MB
• External Data Transfer Rate: 600 MBps
• Average Latency: 4.16 ms
• Sector Size: 512e
• Ports: Dual Port
• Hot-Swap: Yes
• MTBF: 1,200,000 hours
• Power Consumption (Operational): 11 W

Tips

Before installation, verify that your HPE ProLiant server supports 4TB SAS midline drives and that the drive firmware is compatible with your Smart Array controller. Use the hot-swap feature to replace drives without shutting down the server, but always follow proper anti-static procedures.