IBM 500GB 7.2K 6Gbps SAS 2.5" SFF Slim-HS  HDD 

IBM FRU # 42D0707
IBM OPTION : 42D0707
IBM Part #: 42D0707
Form Factor: 2.5"
Capacity: 500GB
Interface Type: Serial Attached SCSI(SAS).
SPEED: 7.2K RPM
Included: IBM SYSTEM X Tray

For x3650M2/X355M2/x3650M3/X355M3