1. Installing Internal Optional DevicesExpress5800/R120d-2M User’s Guide 105Chapter 2 Preparations1.25 Hard Disk DriveHard disk bays are provided at the front of the server.A hard disk drive mounted in a dedicated drive carrier can be purchased. Install the hard disk drive on theserver with it mounted in the drive carrier.Important Use hard disk drives specified by NEC. Installing a third-party hard diskdrive might cause a failure of the server and it.Note the following precautions to install hard disk drives.• For onboard connection, hard disk drives having different capacities, interface types, or rotational speedscannot be installed together.• In the RAID System, all the hard disk drives in a group (pack) must have the same capacity, interfacetype, and rotational speed.Bays can contain up to 8 hard disk drives (when HDD cage is added, 16 HDDs can be installed).Port numbers have been assigned to each slot.1.25.1 InstallationInstall a hard disk drive by using the following procedure.Important In the RAID System, build a Disk Array using hard disk drives that have thesame specifications (capacity, rotational speed, and standard).1. Refer to Chapter 2 (1.3 Overview of Installation and Removal) for preparations.2. Locate the slot where you install the hard disk drive.The server provides 8 slots (or 16 slots when additional HDD cage is installed). Install hard disk drivesin ascending port number order.3. Remove the dummy trays.Dummy trays are installed in all slots.Note Keep the dummy trays for future use.