Features: Internal SFF-8643 to (4) 29pin SFF-8482 connectors with Power Port, connecting controller (SFF-8643) to four disks (SFF-8482). Please note that SFF-8643 is Host, 4 29 (SFF-8482) is Targets, Internal mini Serial Attachment SCSI (SFF-8643) to (4) x1 (SFF-8482) Serial Attachment SCSI (controller base) fan-out cable. Before you buy this cable , please make sure SFF-8643 on your motherboard. If the SFF-8643 on your backplanes, this cable will not work with them. SFF-8643 connect to the controller, 4 SFF-8643 connect to the HDD (Hard Disc Driver) Suitable for use in data centers, workstations, ensuring a secure and stable link for high performances data processing. Specifications: Component:ABS Working current: 0.5A contact current. Insulation impedance: 500Mohm Low power contact impedance: 80Mohm Insertion force: 55.5N Operating temperature: -20℃~85℃ Length:0.5m/1m Package Includes: 1 Set Data Transfer Cable note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.