Express IBM 500GB 7.2K 6Gbps NL SAS 2.5-inch SFF Slim-HS HDD pre servery: x3400 M2; x3400 M3; x3500 M2; x3500 M3; x3550 M2; x3550 M3; x3650 M2; x3650 M3; x3850 X5;