Here's my minimal experience with 80-pin to 50-pin adapted SCA drives:
1) mine also wouldn't recognize initially.
2) I believe I used jumpers on the "DLY" delay which causes the drive
to have time to spin-up from a cold start before it sends anything to
the Mac. My drives spun-up super slowly, and the "DLY" seemed be
important because they wouldn't mount without a DLY jumper present.
3) I had to initialize the drive the first time with software other
than Apple. I used FWB HD Toolkit I believe? Once initialized, the
Apple software saw the drive, and I could reinitialize with the Apple
software.
4) termination is voodoo and important, a change in termination can
make all the difference.
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