These are Fiber Channel not for PC . The Hitachi Internal Hard Drive FCAL HUS156045VLF400 is a reliable storage solution for enterprise use with a storage capacity of 450GB and a rotation speed of 15K RPM. This silver-colored drive is designed in a 3.5-inch form factor and is an HDD type internal desktop drive. With a cache size of 64MB, this Hitachi drive from the Ultrastar product line offers consistent performance and high availability, making it a dependable choice for businesses looking for stable data storage solutions. Made in Singapore, this unit is a dependable choice for those seeking reliable storage options.