The IBM 1746-5195 is available from Calhoun Technologies. Calhoun Tech can help your company save up to 80% on IT Hardware. Manufacturer: IBM Part Number: 1746-5195 Details: IBM 1746-5195 4Tb 7200 Rpm 6Gb Sas Nl 3.5 For Ds3512/Exp3512 - 1 Year Warrant