Internal Mini-SAS interface card adapter Lenovo ISG 4Y37A78837 — PCIe host, Mini-SAS output, 12 Gbit/s

The Lenovo ISG 4Y37A78837 is an internal Mini‑SAS interface card adapter designed for server storage connectivity. It installs into a PCIe host slot and provides Mini‑SAS external connections with up to 12 Gbit/s transfer rate, enabling attachment of external storage enclosures and tape drives compatible with Mini‑SAS. The adapter is supplied as a single unit and is certified for multiple regions (FCC Part 15 Class A, AS/NZS CISPR 22, ICES‑003 Class B).

Advantages

The adapter offers PCIe 4.0 host connectivity combined with Mini‑SAS HD external ports to deliver high throughput for external storage. It supports common server storage features such as S.M.A.R.T. monitoring and is purpose-built for ThinkSystem servers and compatible storage arrays. Compact connector layout provides either two or four x4 external Mini‑SAS HD links depending on the model, allowing flexible external expansion at 12 Gbit/s per link.

Suitable for

• Connecting external storage enclosures (e.g., Lenovo ThinkSystem DE Series)
• Attaching LTO tape libraries and drives
• Expanding server storage capacity via external JBODs
• Server environments requiring 12 Gbit/s SAS connectivity

Key specifications

• Brand: Lenovo
• Model / MPN: 4Y37A78837
• Form factor: Internal PCIe adapter
• Host interface: PCIe (PCIe 4.0 compatible)
• Output interface: Mini‑SAS HD external connectors (two or four x4 links depending on variant)
• Transfer rate: Up to 12 Gbit/s per link
• Certifications: FCC Part 15 Class A, AS/NZS CISPR 22, ICES‑003 Class B
• Supplied quantity: 1 unit

How to use

Power down the server and install the adapter into an available PCIe slot following the server manufacturer's instructions. Secure the card, connect compatible Mini‑SAS HD external cables from the adapter's external ports to the target storage enclosure or tape device, and then power on the system. Install or verify appropriate drivers and firmware on the host operating system and confirm device recognition in the server management utilities. For best results, use certified Mini‑SAS cables and ensure firmware compatibility between adapter and external storage.

Recommendations

Use this Mini‑SAS adapter in server racks with compatible ThinkSystem storage or other certified SAS enclosures. Match cable length and shielding to your environment, keep firmware up to date, and follow Lenovo's installation and safety guidelines to ensure reliable 12 Gbit/s external connectivity.