4-48 Upgrading Your SystemHard Disk DriveThe server has seven hard disk drive slots to install hard disks with the SCA2interface (Ultra 160 SCSI.) Up to six hard disk drives can be installed in thestandard configuration. If using the flex bay to install a hard disk, you can installup to seven hard disk drives in the server.All seven slots may contain a hard disk approximately 25.4 mm (1 inch) high.The SCSI IDs of ID0 through ID5 are always assigned to hard disks as shown inFigure 4-53.ID0ID1ID2ID3ID4 ID5ID8Figure 4-53. Hard Disk Drive SCSI IDsIn the standard configuration hard disk drive bays are connected to the SCSIconnector on the system board when the server is shipped. To use the hard diskdrives in a disk array configuration, reconnect the cable from the connector onthe system board to the disk array controller connector. For the cablereconnection, see "Disk Array Controller".A dummy tray is installed in all unpopulated hard disk drive bays. The purposeof a dummy tray is to ensure the cooling effect in the server. Always install adummy tray in slots not containing a hard disk drive.