• Seagate ST980210A (LD25 Series 5400.2)

Despite the form factor, this hard drive is explicitly not designed for laptop/notebook use. It will work in this application, but may have issues. From the LD25 manual:

LD25 Series 5400.2 drives are quieter, lighter and use less power than 3.5-inch drives. They are ideal for applications requiring the form and fit of a notebook drive but without some of the design specifications required by notebook drives such as high shock tolerance, high performance, and power management. LD25 Series drives are not presently suited for notebook applications or other environments with high operating temperatures.