Western Digital Re 4TB 7200RPM 6Gb/s SAS 3.5-inch Enterprise Hard Drive

Model: WD4001FYYG | Series: Re (Datacenter Capacity) | Form Factor: 3.5" LFF

The Western Digital WD4001FYYG is a member of the "Re" (RAID Edition) family, specifically engineered for high-availability storage arrays and enterprise-class data centers. Designed to handle 24/7/365 heavy duty cycles, this drive offers a massive 1.4 million hour MTBF. Unlike consumer drives, the Re series features specialized vibration protection and a dual-actuator head positioning system, ensuring consistent performance even in a chassis filled with dozens of other high-speed vibrating drives.

📊 Technical Specifications

• Capacity: 💾 4 TB (4,000 GB)

• Interface: ⚡ SAS 6Gb/s (Dual Port / Full Duplex)

• Rotation Speed: 🏎️ 7,200 RPM

• Cache: 🧠 32 MB

• Sustained Transfer Rate: ✍️ 182 MB/s

• MTBF: 🛡️ 1,400,000 Hours

• Sector Size: 📏 512n (Native) or 512e (Depending on firmware/revision)

• Advanced Features: RAFF (Rotational Acceleration Feed Forward), TLER (Time-Limited Error Recovery)

✅ Product Overview

• Dual Port SAS Connectivity: This is a true Enterprise SAS drive. The dual-port interface provides redundant paths to the data, eliminating single points of failure. If one path to the controller fails, the server can still access the data through the second port.

• RAFF Technology: Enhanced Rotational Acceleration Feed Forward technology monitors the drive and corrects both linear and rotational vibration in real time. This is critical for maintaining performance in high-density rackmount servers.

• Multi-Axis Shock Sensor: Automatically detects the subtlest shock events and compensates to protect the data, ensuring the drive remains stable in rigorous environments.

📦 Compatibility & Use Case

• Target Systems:

  • Disk Shelves & SANs: Ideal for Dell PowerVault, NetApp, or HP MSA enclosures.

  • High-End NAS: Perfect for rackmount NAS units (Synology RS, QNAP TS) that support SAS drives.

• Ideal Workloads:

  • Bulk Data Storage: Massive archives, backups, and long-term data retention.

  • Video Surveillance: Designed to handle the constant, 24/7 sequential write streams of high-definition security cameras.

  • Cloud Storage Infrastructure: Built to scale in large distributed file systems and object storage Installation Note

    ⚠️ SAS vs. SATA: This is a SAS (Serial Attached SCSI) drive. It has a physical connector that is slightly different from a SATA drive. It will NOT work in a standard home PC, Mac, or desktop motherboard unless you have a dedicated SAS HBA or RAID controller card (like the Dell PERC or HP Smart Array cards we discussed earlier).

    💡 Power Consumption: Enterprise 7200RPM drives pull more power and generate more heat than "Green" or "Red" consumer drives. Ensure your server has adequate cooling and that your power supply can handle the "spin-up" current if you are installing many of these at once.

    The Western Digital WD4001FYYG is a legendary enterprise workhorse. It combines massive 4TB density with the mission-critical reliability of the SAS protocol, making it a top choice for professional storage admins.