Dell PowerEdge 750 - Manual (Page 62)

When you disconnect an interface cable, take care to grasp the cable connector, rather than the cable itself, to avoid stress on the cable.
SCSI ID Numbers
Each drive attached to a SCSI controller must have a unique SCSI ID number from 0 to 15.
l The SCSI hard drive from which the system boots is configured as SCSI ID 0.
l If you install optional SCSI drives or change your SCSI configuration, see the documentation for each SCSI drive for information on setting the
appropriate SCSI ID number.
Device Termination
SCSI logic requires that termination be enabled for the two drives at opposite ends of the SCSI chain and disabled for all drives in between. For internal SCSI
drives, termination is configured automatically. See the documentation provided with any optional SCSI drive you purchase for information on disabling
termination.
Configuring the Boot Drive
The drive or device from which the system boots is determined by the boot order specified in the System Setup program. See "Using the System Setup
Program" in your User's Guide. To boot the system from a hard drive or drive array, the drive(s) must be connected to the appropriate controller:
l To boot from a single SATA hard drive, the master drive (drive 0) must be connected to the SATA_PORT_0 connector on the system board. To identify
system board connectors, see Figure A -3 .
l To boot from a single SCSI hard drive, the drive must be connected to the SCSI controller card. See the documentation that accompanied the controller
card.
l To boot from a SCSI RAID array, the drive must be connected to the RAID controller card. See the documentation that accompanied the controller card.
Hard Drives
Your system contains up to two non-hot-pluggable SATA or SCSI hard drives. If your system contains SCSI hard drives, they must be connected to a SCSI
controller board. The cables for hard drive 1 are routed in the cable tray that is part of the fan assembly.
The procedures for removing and installing SATA or SCSI hard drives are the same.
Removing a Hard Drive
1. Open the system. See " Opening the System " in "Troubleshooting Your System."
2. If applicable, remove the optional CD drive or optional diskette drive.
Remove the CD drive if you are removing hard drive 0. See " Removing the Optional CD Drive ."
Remove the optional diskette drive if you are removing hard drive 1. See " Removing the Optional Diskette Drive ."
3. Disconnect the power and interface cables from the hard drive.
NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that drives be attached to the cable in order by ID number.
CAUTION: See your System Information Guide for complete information about safety precautions, working inside the computer, and protecting
against electrostatic discharge.