IBM System x3300 M4 Installation And Service Manual page 336

3. Connectors on the 2.5-inch hard disk drive backplane:
4. Connectors on the 2.5-inch hard disk drive backplane with the expander:
Note: If the server is configured for RAID operation using a ServeRAID adapter,
you might have to re-configure your disk arrays after you install drives. See the
ServeRAID adapter documentation for additional information about RAID
operation and complete instructions for using the ServeRAID adapter.
Review the following information before connecting cables to the backplanes:
1. For server models with eight 2.5-inch hot-swap hard disk drives with the
redundant power supply:
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System x3300 M4 Type 7382: Installation and Service Guide