werner@molokai.sw.mcc.com (Werner Uhrig) (06/01/89)
In <25065@agate.BERKELEY.EDU>, lauac@qal.qal.berkeley.edu (Alexander Lau) : > In <7598@spool.cs.wisc.edu> engber@shorty.cs.wisc.edu (Mike Engber) writes: > >Has anyone else had problems booting an SE/30 with an external SCSI > >drive attached, but not powered up. This seems like the same problem > >a mac+ with old ROMs has. Did Apple make the same mistake twice? > Nah, it's not Apple's fault. All SCSI devices on a chain must be on. > That includes your external drive, since it's connected. not quite. if a) you set the jumpers on the external hard disk (if it has such) so that the terminators are NOT powered by the drive and b) if you have a MAC more recent than a Mac+ (which provides terminator power to external drives) then your Mac works just fine with the external drive turned off either when you boot, or you can turn it off without removing it while using your Mac and other drives (I would recommend bringing the drive to a graceful halt, though, dismounting mounted partitions and parking the heads before powering down). I guess having 2 machines in front of me which I use this way every day makes me an expert witness on the matter (I sure hope I did not get any of the details mixed up in the description above, though). Cheers, ---Werner PS: it's about time someone comes out with an expert-system providing answers to Mac-questions by email, so this group isn't such a volumenous mess of half-truths (or worse)... would make a good theses-topic and has commercial potential I would think.... -- --------------------------> please send REPLIES to <------------------------ INTERNET: uhrig@mcc.com (if unavailable: werner@rascal.ics.utexas.edu) UUCP: ...<well-connected-site>!milano!werner ALTERNATIVE: werner@astro.as.utexas.edu OR werner@utastro.UUCP