IBM x3550 M4 Type 7914 Installation And Service Manual page 239

Figure 117. 2.5-inch hot-swap hard disk drive IDs
3.5-inch hot-swap hard disk drive IDs:
The hot-swap-drive ID that is assigned to each drive is printed on the front of the
server.
The following illustration shows the location of the IDs of the hard disk drives.
The ID numbers and the drive bay numbers are the same.
Figure 118. 3.5-inch hot-swap hard disk drive IDs
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Chapter 6. Removing and replacing components