Read more Read more MB324SP-B MB326SP-B MB322SP-B MB732SPO-B MB742SP-B MB741SP-B Number of 2.5" drive supported 4 6 2 2 2 1 Compatible drive bay 1x External 5.25" Bay 1x External 5.25" Bay 1x External 5.25" Bay 1x External 5.25" Bay 1x External 3.5" Bay 1x External 3.5" Bay Support 2.5" drive height 5mm to 12.5mm 5mm to 9.5mm 5mm to 9.5mm 5mm to 15mm 5mm to 9.5mm 5mm to 15mm Support Drive Type SATA/SAS (Single Channel) SATA SATA/SAS (Single Channel) SATA/SAS (Single Channel) SATA/SAS (Single Channel) SATA/SAS (Single Channel) Cooling fan ✓ ✓ - - - - Adjustable Fan Speed ✓ ✓ - - - - Device Connector 4x SATA 7pin 6x SATA 7pin 2x SATA 7pin 2x SATA 7pin 2x SATA 7pin 1x SATA 7pin Power Connector 1x SATA 15pin 2x SATA 15pin 1x SATA 15pin 1x SATA 15pin 1x SATA 15pin 1x SATA 15pin