AC450NX Rack Server System Product Guide
102

SCSI SCA Hard Disk Drives

The server supports a variety of single-ended and differential SCSI SCA-type hard disk drives. As
shipped from the supplier, the server may not contain any drives. Contact your sales representative
or dealer for a list of approved drives that can be installed in the server.

Mounting a SCSI SCA Har d Disk Drive in a Carr ier

See Figures 10-1 and 10-2.
1. Remove the 3.5-inch hard disk drive from the protective wrapper, and place it on an antistatic
surface.
2. Record the model and serial numbers of the drive in your equipment log.
3. Orient the drive carrier so that the handle is toward your left and the metal EMI/ESD fingers
are toward your right.
4. Orient the drive so that the board-side faces toward the finger-side of the carrier and the SCA
connector faces away from you.
5. Being careful not to damage the metal fingers of the carrier, place it on the drive.
6. Place the drive and carrier assembly on an antistatic surface of a table or a workbench so that
the drive handle and fingers overlap the edge of the table or the workbench.
7. Using four screws of the appropriate size and length (not supplied), attach the carrier to the
drive.
CAUTION
Some specific hard disk drive designs require electrical isolation of the drive
from the chassis or other ground paths. These drives are usually clearly
labeled with this requirement on the drive. Full-height, 1.6-inch drives with
this requirement must have an electrical isolator such as durable mylar tape
placed between the EMI/ESD grounding fingers and the top cover of the
drive. Failure to isolate this type of drive from the ground path will result in
unpredictable operation of the drive, including severely impacted
performance and data corruption.