The mixed lot of 6 hdd internal desktop drives from the Seagate Barracuda product line. These 3.5-inch hard drives have a storage capacity of 500 GB each and a rotation speed of 7200 RPM. With a transfer rate of 6.0 Gb/s and a cache size of 32 MB, these HDDs are suitable for use with PCs and offer features such as RoHS compliance and advanced format storage. The drives are compatible with SATA III, SATA II, and SATA interfaces, making them a versatile option for enhancing storage capacity in desktop computers.