Physical Dimensions; Drive Mounting - Western Digital Re EX800M Technical Reference Manual

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Table Of Contents

Table of Contents

EX800M

2.3.1

Height

Length

Width

Weight (3-disk)

Weight (5-disk)

2.3.2

Use either the four bottom screws or at least four of the side mounting screws to rigidly support the

drive and prevent vibration. Some adaptor frames may not have the mechanical design structure

capable of mounting the drive to meet the specified shock and vibration requirements.

The hard drive itself does not provide electrical isolation between mounting locations and drive ground

connection. If electrical isolation is required, the system designer or integrator would be responsible for

providing a solution.

2.3.2.1

If your system does not support hot plugging (see "Hot Plug Support" on page 21), it must be turned

off and unplugged before installing your hard drive.

2.3.2.2

You can mount the hard drive in the X, Y, or Z axis, depending upon the physical design of your

system. For best results, mount the drive with all four screws grounded to the chassis. If all four screws

are not used, see "Grounding" on page 7.

2.3.2.3

The hard drive should be mounted to the chassis using four 6-32 screws. Recommended screw torque

is 5 in-lb. Maximum screw torque is 10 in-lb.

CAUTION: Screws that are too long can damage the hard drive. Hard drive screw penetration

can differ between products depending upon hard drive design. WD's minimum design criteria is

to always meet the SFF 8301 industry standard specification. The industry standard as defined in

the SFF 8301 specifies a maximum of 3 mm screw penetration, and for a minimum of 2.4 mm of

thread engagement from both the screw and the hard drive.

See Figure 2-1 for allowable fastener penetration for this product family.

2.3.2.4

The PCBA and HDA grounds are always connected together in the drive and cannot be disconnected.

The drive mounting screws, unless intentionally isolated, will provide additional ground connections

between the HDA and the system chassis. If the drive isn't grounded via mounting screws as described

under "Hard Drive Installation" on page 44, there may be increased electrical emissions (EMI).

2679-771339-A05