Samsung 400GB 12Gb/s SAS 2.5-inch SFF Mixed-Use (MU) Enterprise SSD
Model: MZ-ILS400N | Part Number: MZILS400HEGR-000C3 | Series: PM1635a
The Samsung PM1635a (MZ-ILS400N) is a high-performance, ultra-reliable enterprise solid-state drive built for modern data center architectures. Utilizing a high-bandwidth 12Gbps SAS interface and advanced V-NAND architecture, this 400GB drive is classified under the Mixed-Use (MU) category. Featuring a robust endurance rating of 3 Drive Writes Per Day (DWPD), it delivers the perfect balance of fast read access and consistent, heavy random-write performance over a long service life.
📊 Technical Specifications
Capacity: 💾 400 GB
Interface: ⚡ SAS 12Gb/s (Dual-Port / Full Duplex)
Form Factor: 📏 2.5-inch SFF (Small Form Factor)
Series / Architecture: 🧠 Samsung PM1635a Enterprise
NAND Type: 🧬 Samsung Enterprise V-NAND (3D TLC)
Sequential Read: 🏎️ Up to 1,300 MB/s
Sequential Write: ✍️ Up to 1,150 MB/s
Random Read/Write: 📉 Up to 190,000 / 45,000 IOPS
Endurance Rating: 🛡️ 3 DWPD (Mixed-Use Endurance over 5 Years)
✅ Product Overview
Samsung PM1635a Controller Performance: An upgraded iteration of the original PM1635 framework, the "a" version utilizes optimized firmware and controller logic to maintain highly predictable, flat latency curves even under 100% continuous data center saturation.
Balanced Mixed-Use Endurance: Engineered to handle highly unpredictable read and write bursts concurrently. The 3 DWPD rating guarantees it will vastly outlast standard "Read-Intensive" or consumer-grade boot drives under continuous write stress.
Dual-Port SAS-3 Efficiency: Features a native active-active dual-path SAS interface layer. If a host bus adapter (HBA), connection loop, or storage controller fails, data traffic instantly routes to the secondary port to eliminate downtime.
Onboard Power-Loss Protection (PLP): Outfitted with high-grade internal capacitor arrays. In the event of a sudden data center power failure, the drive retains independent electrical reserves long enough to flush all cached data safely to permanent NAND.
📦 Compatibility & Use Case
Target Systems:
Ideal Workloads:
🛠️ Installation Note
⚠️ SAS Interface Only: This is a SAS (Serial Attached SCSI) enterprise drive. It features a unified SAS connector interface and will not function if plugged into standard consumer desktop SATA cables or desktop motherboards without a dedicated SAS host bus adapter (HBA).
💡 Tray Caddy Tip: This listing is for the bare drive mechanism with its generic OEM Samsung firmware configuration. If you are selling this drive pre-mounted in a specific server tray (such as a Dell 8FKXC/DXD9H or HP SmartDrive carrier), ensure you note it in your item specifics to attract exact-match buyers!
The Samsung PM1635a 400GB SSD offers a premier blend of 12G SAS performance, active-active dual-port safety, and rugged mixed-use endurance for high-stress server environments.
