Asus AP1720-E2 - Manual (Page 53)

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SATA backplane jumper settings and HDD ID assignments
The 6-pin jumper J1 allows you to define your desired SATA configuration.
The picture below shows the location of jumper J1 with pins 1-3 and 2-4
shorted.
Refer to the table for the jumper
settings and the appropriate ID# for
each SATA HDD bay.
J1 setting
(1-3 shorted, 2-4 shorted)
Device SATA BP ID
Drive Bay 1 CON2
Drive Bay 2 CON4
Drive Bay 3 CON6
Drive Bay 4 CON8