> I currently have the following setup, and the Plus just doesn't see > these hard drives. > > [Plus]===[Inline Term]==[HDD]==[Term] > > I was under the impression that the SCSI chain needs to be terminated on > both ends in order to work. I also tried without the inline terminator, but > no go. Additionally, I have tried changing the SCSI ID, but I was under the > assumption that the Mac has an ID and the rest are all free. Any hints as > to what I'm doing wrong? I opened up the HD case and it has the Apple ROM > sticker (80 with the Apple Logo). So it's an 80MB Quantum HD, with Apple > ROMs. However, the SCSI HD setup Apple disk doesn't see it, everything I've > tried reports no SCSI device on the bus.
Here are a couple things to look out for: 1) The Plus doesn't supply terminator power, so you have to make sure that the external drive is set up (via jumper options, usually) to get its terminator power from the external supply, not the Plus. 2) Having an inline terminator won't hurt (and, in fact, conforms to the standard "one terminator at each end of the bus" rule). If the scsi cable is short, you can readily get by with just one terminator at the end, though. 3) Just make sure that the drive itself isn't already internally terminated (with 3 skinny resistor packs in a line right by the scsi connector). If it is, then your setup will have one too many terminators on the bus, and that won't work. 4) That particular Quantum drive is of the notorious family of "stiction" afflicted drives. Make sure that it is actually spinning up. If it unsticks after too long a delay after powering on, it will also wake up in a bad state and won't be recognized. In that case, a short power cycle (short enough so that the platter doesn't quite stop spinning) will often take care of things. 5) Doublecheck that the external power supply is actually supplying the right voltages (+5, +12). They should be within 5% of nominal. If you still can't see the drive, then either the Plus has a bum scsi chip (or bad connector), or the drive itself is toast. Luckily, cheap drives for the Plus are available by the bushel. Good luck! -- Prof. Thomas H. Lee Center for Integrated Systems, CIS-205 420 Via Palou Mall Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu 650-725-3709 voice, -3383 fax -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
