Seagate ST1800MM0149 1.8 TB 2.5" SAS 12Gb/s 10000 RPM 256 MB internal hard drive

Capacity and form factor

The Seagate ST1800MM0149 is a 1.8 TB 2.5" internal hard drive built for servers and storage arrays that need fast, reliable capacity in a compact bay. Its 10000 RPM spindle speed and 256 MB buffer serve workloads where consistent throughput matters more than raw bulk.

1.8 TB at 10000 RPM

The 1.80 TB capacity handles operating systems, databases and active project files with low average latency. The 10000 RPM rotation keeps random I/O responsive, but sequential transfers will saturate well before a modern SSD, so the drive runs out of steam on sustained high-queue workloads.

SAS 12Gb/s interface limits

The SAS 12Gb/s interface caps peak bandwidth at 12 Gb/s, so the drive cannot exceed that ceiling even during burst reads from the 256 MB cache. Controllers or backplanes limited to 6 Gb/s will halve the available headroom, and the physical 2.5" form factor prevents use in 3.5"-only bays without an adapter.