Seagate ST3146855SS 146GB 15000RPM 3.5" SAS internal hard drive

146 GB 15 000 RPM SAS drive

This 3.5-inch enterprise hard drive spins at 15 000 RPM and connects through a 3 Gbps SAS interface. It delivers 146 GB of capacity with a 16 MB cache and ships inside an IBM X Series caddy for direct rack installation. The drive suits servers and storage arrays that prioritise low latency over raw capacity.

Replaces slower 10 000 RPM SAS disks

Moving from a 10 000 RPM unit cuts average rotational latency roughly in half, which matters for random read workloads such as database indexes or transaction logs. The jump is worth it when the application is I/O-bound and the smaller 146 GB footprint is acceptable. Buyers who need more storage per spindle should look elsewhere.

Sustained throughput under heavy queue depth

At 15 000 RPM the platters maintain consistent sector-to-head timing, so sequential transfers hold near peak rate even with deep command queues. The 3 Gbps SAS link and 16 MB buffer absorb bursts without stalling the host bus. Thermal output stays stable during extended writes because the motor speed does not throttle.