This ibm system storage 600gb 15krpm 6gb sas 35 inch hdd fru 49y1870 requires an available disk drive bay in an ibm ds3512 or exp3512 expansion unit ibm best practices for this 49y1870 hard disk drive require a minimum model type 1746 firmware revision of 07701601 and a minimum exp3500 esm firmware revision of 316 contact our technical support team if you need assistance in ordering or integrating this hdd into your existing ibm system storage environment