ASUS Z9PE-D16/2L 사용자 설명서

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ASUS Z9PE-D16 Series
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3.  Hard disk activity LED connector (4-pin HDLED1)
This LED connector is for the storage add-on card cable connected to 
the SATA or SAS add-on card. The read or write activities of any device 
connected to the SATA or SAS add-on card causes the front panel LED to 
light up.
4.  SAS connector -- PSAS connectors
 
SAS connector - PSAS connectors are for the SAS signal cables for SAS 
hard disk drives that allows up to 6Gb/s of data transfer rate.
If you installed SAS hard disk drives, you can create a RAID 0, RAID 1, RAID 
10, or RAID 5 configuration. 
The actual data transfer rate depends on the speed of SAS hard disks installed.