Congratulations on your purchase of a BUSlink® product. We appreciate the confidence you have in our products. Our goal is to keep you in touch with the latest technology and the best service available. Please read through these operating instructions. After you finish, put them away in a safe place for future reference. Also save the box in case you need to return the product for repair.This BUSlink 4-Bay RAID hard drive supports large capacity and dual USB 3.0+eSATA interface. It supports Intelligent RAID function: RAID 0, RAID 3, RAID 5, RAID 10, and Large. Removable HDD trays support hot-plug replacement of drives (only for RAID with redundancy mode). HDD intelligent sleep function is supported. The LCM display and buttons support convenient setting of RAID modes and status display. Optional password allows locking of RAID settings. Cooling fan maintain safe operating temperature. Included CD allows software control of RAID mode and status display in PC. Skid proof and shockproof rubber feet mat ensure safe operation.