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Master/slave
configuration jumpers
Circuit board
Pin 1
Pin 20 removed for keying
Note. Drive is shown with
circuit board up.
B D
A C
Drive is master; slave may be detected using DASP– signal
Drive is master; Seagate slave drive present
Drive is slave; Seagate master drive present
Use CSEL pin grounding to differentiate master from slave
Figure 1. ATA interface connector and master/slave
configuration jumpers
ST9655 Family Installation Guide, Rev. A 3