The Western Digital Protege 40GB 3.5" IDE Hard Drive is a reliable internal desktop drive suitable for both PC and Mac systems. With a sleek silver design and a storage capacity of 40GB, this HDD is equipped with a rotation speed of 5400 RPM and a cache size of 2MB. Featuring the DMA/ATA-100 interface, this Western Digital hard drive is a dependable choice for expanding storage capabilities in your computer system.