Asus P5Q3 Deluxe/WiFi-AP @n - Manual (Page 52)

2-28 Chapter 2: Hardware information
4. SIL5723 Serial ATA connectors [orange] (7-pin SATA_E1-2)
These connectors are for the Serial ATA signal cables for Serial ATA hard
disk drives. If you installed Serial ATA hard disk drives, you can create a EZ
Backup or a Super Speed configuration with the Drive Xpert Technology
through the onboard Silicon Image ® SIL5723 controller.
Before using the Drive Xpert technology, make sure that you have connected
the SATA signal cables and installed SATA hard disk drives.
• The SATA_E1 and SATA_E2 ports are for SATA hard drives only. ATAPI
device is not supported.
• Make necessary backup before using the Drive Xpert function:
All original data of the SATA_E2 hard drive will be erased for EZ Backup
setup.
All original data of the two hard drives will be erased for Super Speed
setup.