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External cd-rom not showing on desktop

Posted on 2003-03-24
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Last Modified: 2013-11-17
I have a Power Macintosh 6500/250 with Mac O/S 8 installed.  I have an external SCSI cd-rom attached to it.  The SCSI i.d.'s are okay.  When I insert a cd into the external cd-rom drive it is not recognized/shown on the desktop.  If I boot with my O/S 8 cd in the "regular" cd-drive of the computer, THEN the external cd-drive with any cd is recognized/shown on the desktop.  I read the post about the Quadra 950 with the similar problem but that didn't help. I downloaded ResEdit but it does not show the CD icon for making any changes.  I can't figure this out because my other Mac's pick up these drives immediately.  I am not having any problems with my other cd-drive...no problems with booting or anything like that.  Any help would be appreciated.
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Question by:kleankutken
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Expert Comment

by:weed
ID: 8199668
Do you have the drivers for that scsi device installed?
Why run 8 when you can run 8.1 for free?
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Author Comment

by:kleankutken
ID: 8199742
I just haven't gotten around to getting the 8.1 update for that Mac yet.  I have several of these external cd-rom drives.  You have to open them up to see what brand they are except for the LaCie models which I can't find any drivers for.  I have NEVER, NEVER needed any "extra" drivers for any of my other Mac's or PC's.  That is what is throwing me.  Thanks.
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by:weed
ID: 8199869
I know that some CD drives werent covered under the apple cd driver. Would definitely make a difference.
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Expert Comment

by:nitefall
ID: 8203981
How many SCSI devices are there in the external chain?  If there are more than one, then try disconnecting ALL but the problematic CD ROM drive.  Boot the machine and see what you get.

If you have access to the CD ROM drive, at this point you could have a SCSI address issue or even a termination issue.

Many external units have a little switch on the back that activates or deactivates built in termintation.  If you don't have one you may need to get a terminator for the chain.

The problem with SCSI is the voodoo requred to make it work the first time.  Depending on your motherboard, AND the OS, AND which device is the boot device, you can have different termination needs...

I have seen it as you describe before that booting off the internal CD will recognize the external device, but booting off the HD will not...

Last, I am not familier with the 6500...  I know that hte HD is IDE but what is the internal CD ROM??  Is it IDE or SCSI?

If it is SCSI it will use the ID of 3 (mac default) so if you have an external device using that same ID then you will have a conflict.

I think since you have an IDE HD, you probably have an IDE CD  Your machiene was derived from the Performal line which at that time was primarily IDE. ( an IDE CD would also eliminate the issue of getting different termination needs when booting from different devices)

So back to problems with the external bus...

If you try the termination and it doesn't work, the only thing left would be to check that your system software is correctly installed and possibly doing that 8.6 upgrade...  8.6 was nice.

Hope that helps
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Accepted Solution

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msents earned 300 total points
ID: 8220933
Clearly this is a driver problem. Updating the OS may resolve it, or there are some old drivers floating around the net. I Follow this link for an easy fix: http://www.euronet.nl/users/ernstoud/cdrom.html
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Author Comment

by:kleankutken
ID: 8221615
I knew it was a driver and had received one directly from LaCie(almost immediate response to my email), but could not figure out how to install what they sent.  I used your "msents" link to CD-Sunrise and then dragged the icon into my extensions folder, re-booted and Voila!!! Thank you all very, very much.  
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