Fast installation and replacement of hard disks by using hard disk carriers, hard disk carriers suitable for 3.5" or 2.5" HDD or SSD U.2(32GB) / SAS / SATA backplane for 4x 3.5"/2.5" PCIeNVMe/SSD/HDD in one slide-in module. Form factor of the module: 3x 5.25". (1.) Data connection to external: 2x SFF8654: SFF8654x8, PCIe3.0x8, 2xU.2 each, 7.9GByte/s. (2.) Data connection to external: 1x SFF8643: 12G for SATA (6G) and SAS (12G). (3.) Power supply via 2x MOLEX connection. (4.) Internal data connection: 4x U.2/SAS/SATA. 4x hard disk access LEDs: green - switched on / flashing blue - data access. 1x 80x80x25 mm fan. Housing, plug-in units and front doors made of metal/plastic. Housing, slide-in units, front doors black. Scope of delivery: Screw set