Buffalo OP-HD4.0N

Overview

The Buffalo OP-HD4.0N is a 4TB replacement hard drive designed specifically for compatible TeraStation network storage devices. It features a 3.5-inch form factor and a SATA 6Gb/s interface, matching the original drives in both size and performance. This drive is factory qualified for several TeraStation models, ensuring seamless integration and immediate recognition upon installation. With hot swap capability, it allows you to replace a failed drive without interrupting network access or ongoing backups, making it a practical choice for maintaining continuous data availability.

Key features

• 4TB capacity provides ample space for extensive backups, media libraries, and business data storage.
• Factory qualification for multiple TeraStation models guarantees compatibility and reliable operation.
• SATA 6Gb/s interface supports efficient data transfer rates suitable for network storage demands.
• Hot swap support enables drive replacement without powering down the NAS, minimizing downtime.
• Buffalo firmware alignment ensures the drive is immediately detected and supports smooth RAID rebuilds.
• Tool-free installation simplifies maintenance, allowing quick drive swaps without extra equipment.

Key specs

• Capacity: 4TB
• Form factor: 3.5 inch
• Interface: SATA 6Gb/s
• Weight: 0.74 kg
• Dimensions: 14.7 x 10.2 x 2.5 cm
• Compatible TeraStation models: 3210DN, 3410DN, 3410RN, 5210DN, 5410DN, 5410RN, 5810DN

Connectivity and compatibility

This replacement drive is designed to fit seamlessly into TeraStation NAS units, matching the original hardware specifications. Its SATA 6Gb/s interface ensures it can handle the data throughput required by these network storage systems. The drive’s firmware is pre-aligned with Buffalo’s TeraStation models, which means it is recognized immediately after installation without the need for additional setup or configuration.

Installation and setup

Installing the OP-HD4.0N is straightforward and user-friendly. The tool-free design allows you to open the drive tray and slide the new hard drive into place quickly. Thanks to hot swap support, you can replace a failed drive while the NAS remains operational, avoiding interruptions to file access, media streaming, or scheduled backups. The TeraStation system automatically manages RAID rebuilds, reducing the need for manual intervention.

Ideal uses and environments

This 4TB drive is well suited for small businesses, creative professionals, and home users who require reliable and expandable network storage. It works well for storing large project files, surveillance footage, or consolidated office documents. The drive’s compatibility with multiple TeraStation models makes it a strong choice for users looking to maintain or expand their existing NAS setups without compatibility concerns.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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