Asus P5E3 WS PRO User Manual page 50

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14. USB 2.0 ports 1 and 2 . These two 4-pin Universal Serial Bus (USB) ports
are available for connecting USB 2.0 devices.
15. Optical S/PDIF Out port. This port connects an external audio output device
via an optical S/PDIF cable.
16. USB 2.0 ports 5 and 6. These two 4-pin Universal Serial Bus (USB) ports
are available for connecting USB 2.0 devices.
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DO NOT insert different connectors to these ports.
DO NOT unplug the external Serial ATA box when a RAID 0 or RAID 1 is
configured.
Chapter 2: Hardware information