Lenovo 4B27A60843 ST650 V2 3.5 Sas/sata 4-BAY BP

Lenovo 4B27A60843 ST650 V2 3.5-Inch SAS/SATA 4-Bay Backplane

Overview

The Lenovo 4B27A60843 is a 3.5-inch, 4-bay drive backplane designed for the ThinkSystem ST650 V2 tower server. If you are expanding or replacing drive connectivity in an ST650 V2 build, this is the OEM-matched component — it supports both SAS and SATA interfaces, meaning you are not locked into a single drive protocol when configuring or upgrading storage. At 10 lb, this is a substantial server-grade component, consistent with the metal backplane assemblies typical of enterprise tower platforms.

Key Features

• Dual SAS/SATA Interface Support: The 4B27A60843 accepts both SAS and SATA drives in the same backplane, which matters when you are mixing drive tiers — for example, pairing a SATA SSD for boot with SAS HDDs for bulk storage — without needing separate backplane assemblies or adapter cards. One backplane handles both protocols, simplifying your ST650 V2 storage configuration.
• 4-Bay 3.5-Inch Form Factor: Four large-form-factor bays accommodate 3.5-inch enterprise HDDs, the preferred format for high-capacity bulk storage in on-premises server builds. If your workload calls for multi-terabyte spinning media — common in surveillance archival, file servers, or NAS-style tower deployments — 3.5-inch bays give you the density per slot that 2.5-inch bays cannot match.
• ST650 V2 Platform Match: This backplane is factory-specified for the ThinkSystem ST650 V2. Fitting an OEM-matched backplane avoids the firmware and physical alignment issues that can arise with aftermarket alternatives, and it ensures full hot-swap signaling and LED status behavior work as designed with the ST650 V2 chassis and RAID controller.
• Enterprise Weight Class (10 lb): The 10 lb assembly weight reflects the full metal backplane-and-cage construction standard in commercial tower servers. Plan for this during installation — the cage assembly is not a tool-free swap in all configurations; confirm your ST650 V2 chassis revision and service manual before ordering if a technician will be doing the swap in the field.

Integration & Compatibility

The 4B27A60843 is designed for installation in the Lenovo ThinkSystem ST650 V2 tower server platform. The dual SAS/SATA interface means it is compatible with a broad range of enterprise drives from multiple vendors, as well as Lenovo-branded ThinkSystem drives. Pairing with a SAS HBA or RAID adapter (sold separately) is required to use SAS drives; SATA drives can connect directly to the onboard SATA controller in supported configurations. Verify your specific ST650 V2 chassis configuration guide and the Lenovo ServerProven list to confirm drive compatibility before provisioning storage for production workloads.

Frequently Asked Questions

Q: What server is the 4B27A60843 designed for?

A: The 4B27A60843 is the OEM backplane for the Lenovo ThinkSystem ST650 V2 tower server, specifically the 3.5-inch 4-bay storage configuration.

Q: Does the 4B27A60843 support both SAS and SATA drives?

A: Yes. The backplane supports both SAS and SATA interfaces, allowing mixed drive configurations in the same 4-bay assembly.

Q: How many drive bays does this backplane support?

A: Four bays, each accepting 3.5-inch form-factor drives.

Q: Is a RAID controller required to use this backplane?

A: A SAS HBA or RAID controller is required to use SAS drives. SATA drives may connect to the onboard SATA controller depending on the ST650 V2 configuration. Consult the Lenovo ST650 V2 configuration guide for your specific setup.

Q: What is the weight of the 4B27A60843 assembly?

A: The assembly weighs 10 lb, consistent with a full metal backplane-and-cage construction.

Eden Phillips

When a customer asks me about the 4B27A60843, the first thing I confirm is their chassis revision — this backplane is platform-specific to the ST650 V2, and the dual SAS/SATA interface is the detail that most often determines whether it fits a given storage expansion plan without adding a protocol adapter.

Technical Highlights:

• Dual SAS/SATA Interface: Both protocols on one backplane means you can mix drive tiers in a 4-bay cage — a meaningful advantage when the storage design calls for both high-endurance SAS drives and cost-efficient SATA capacity without a second backplane assembly.
• 4-Bay 3.5-Inch Capacity: Large-form-factor bays maximize per-slot capacity in the ST650 V2 tower, which matters for on-premises archival workloads where spinning media density is the primary constraint.
• OEM Platform Match: Factory-specified for the ST650 V2 — hot-swap signaling, LED status, and RAID controller compatibility are validated against this chassis, not assumed.

Deployment Considerations:

• At 10 lb, this is a full cage-and-backplane assembly. Budget for proper handling and confirm the ST650 V2 service manual for your chassis revision before scheduling a field swap — the install procedure varies by configuration.
• SAS drive operation requires a compatible SAS HBA or RAID controller. If the ST650 V2 in question only has onboard SATA, you will need an additional controller card to use SAS drives with this backplane.

The 4B27A60843 is the right call for an ST650 V2 deployment where the storage design needs flexibility between SAS and SATA in a single 4-bay footprint — particularly in surveillance archival or file-server builds where you expect to grow capacity with a mix of drive types over the server's service life.