ThinkSystem ST50 V2 Internal Drive Cable Kit, contains: 1xSAS-to-4xSATA data cable, connects RAID/HBA to 3x SATA drives (SBB7A09984) 520mm SATA cable for drive bay 3 (SBB7A46040) Power cable for drive bay 3 and the optical drive (SBB7A46041) Power cable for drive bays 1 and 2 (SBB7A46039) Tip: All HDD and SSD drive options include the 185mm SATA cable for use with drive bay 1 or bay 2. The 520mm SATA cable is needed for use with drive bay 3. Cables used in two scenarios: When adding drives to a server with drive bays (cages) but without any drives installed When upgrading from onboard SATA to an HBA or RAID adapter