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| Author | Bigger drives under OS 7.5 (or 7.6?) (Read 13796 times) | ||||||||||||||
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jwally
8 MB  Posts: 12 
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on: October 05, 2006, 06:25
I've been having some problems getting my software to recognize, format and mount various 68 and 80 pin gigabyte drives in a PowerMac 8500. I have some issues with RAM which I think I've cleared up, but I can not get Hard Disk Toolkit or Apple's Disk Setup to recognize these drives on the SCSI buss. I have manuals from each manufacturer, and have attempted to set the jumpers correctly, and I have attempted to set jumpers using the manufacturers suggested settings. I'll be glad to be much more specific if someone wants to discusse this in some kind of depth. I'm really blown away by this because even the drives with the apple on the lable aren't being recognized! Hope someone has some experience with these kind of kinks! Wally |
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RacerX
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32 MB Posts: 36
Reply #1 on: October 05, 2006, 07:02
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This is going to sound messy... well, because it is... but you may want to try connecting to the second SCSI bus on the logic board (there are two... one for the CD-ROM and one for the internal drives). Either the bus port is damaged on the logic board, or the ribbon is damaged, or the adapter for the drives is damaged... and as your system as two SCSI buses, that would be the first place I would start in looking to see where the problem is. The best tool (software wise) for this is SCSIProbe.
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jwally
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8 MB Posts: 12
Reply #2 on: October 09, 2006, 06:26
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The SCSI probe 5.2 only shows the two primary buss's (internal and external) and both drives are visible to SCSI probe as they are to Hard Disk Toolkit. I have had the original 50pin drive at the end of the cable, booting the machine with no problems. Having been told that the "wider" drives have to be at the end of the cable, I moved the original drive to ID4 up the cable and installed a smaller 68pin drive on the end of the cable. I did unterminate the original drive, and terminated the "new" drive as ID0 on the end of the cable. The system boots OK off the original drive. The "new" drive spins up, flashes its led light in what appears to be an appropriate manner. The hard disk toolkit extension checks both drives, and the "new" drive reads "Level One Failure (Low Severity)". Hard disk toolkit and SCSI Probe identify the drive as DEC RZ1AABS (C) DEC REV3001. (The two drives in question are: "boot drive" is a Seagate ST32151N and the "new" drive is a Seagate 32155W.) I haven't found any logical combination of jumper settings that will allow these programs to see this drive as functional. This seems to leave the adapter as the culpret. Described as a "Wide to narrow converter. HD68 male to IDC50 male. Active Negation on high bytes", I'm wondering if maybe I should be looking for a "Mac Compatible" adapter. Or have I been doing something ELSE wrong and don't know it. Thanks for your time Wally
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Ursa
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16 MB Posts: 28
Reply #3 on: October 17, 2006, 02:19
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I say forget the adapter and just get another 50-pin drive--you'll pay less for a used drive than for another adapter and save yourself a lot of hassle. A 2GB 50-pin SCSI drive runs $5-$10 on eBay, and you can often get a mixed lot of such drives for under $20. Happy hunting!
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