Seagate ST11900W/WD/WC ユーザーズマニュアル

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Hawk 2  (Wide bus) Family Install Guide, Rev. C
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ST12400WC family 80 pin SCSI I/O drives
On Hawk 2 family, ST12400WC model drives there is
no J1-auxiliary. J6 can be used to set drive ID, but the
host probably does it over the 80 pin interface. J6 may
be used to drive external LED's and connect the syn-
chronized spindle signal to other drives and the host.
This is described in the notes following Figure 3b.