This is an old specification Seagate 3.5-inch internal hard drive, model ST3290A, with a capacity of 261MB, IDE interface, and a low rotational speed of 3.8K RPM. It is primarily listed by third-party sellers for legacy systems.
Solid build quality. Exactly what you expect from enterprise-grade hardware.
Thermal performance is excellent even under sustained load.
A workhorse for our production environment.