SCSI drive disappears after connecting SCSI2SD v5.5

[krishnadraws]

I finally have my SE/30 booting off of my SCSI2SD. The problem now is that the working internal SCSI platter-based drive no longer spins up or mounts. A few questions: what is the default SCSI ID for an internal platter drive on the Mac SE/30? If I have assigned SCSI ID 1, 2 and 3 to the three volumes on my SCSI2SD is there a chance of a SCSI ID conflict? what happens to the SCSI chain if two drives have the same SCSI ID? 
 

I’m scratching my head on this. For what it’s worth, I plan to remove the SCSI2SD tomorrow to see if the platter drive “wakes up”. 
 

Thanks!

 

[LaPorta]

Usually, the internal drive is always zero.

I'd be concerned if you are saying the drive no longer even spins up. A SCSI conflict won't cause that. Are you sure it is getting power?

 

[Realitystorm]

I finally have my SE/30 booting off of my SCSI2SD. The problem now is that the working internal SCSI platter-based drive no longer spins up or mounts. A few questions: what is the default SCSI ID for an internal platter drive on the Mac SE/30? If I have assigned SCSI ID 1, 2 and 3 to the three volumes on my SCSI2SD is there a chance of a SCSI ID conflict? what happens to the SCSI chain if two drives have the same SCSI ID? 
 

I’m scratching my head on this. For what it’s worth, I plan to remove the SCSI2SD tomorrow to see if the platter drive “wakes up”. 
 

Thanks!

Isn't 5.5 the version that lets you turn the internal terminator on and off in the config application?  Perhaps it off and causing an issue.

 

[krishnadraws]

Thanks, @Realitystorm - I suspect that to be the case now. This morning,  I unplugged the SCSI2SD and the Mac's internal hard drive took over.  So the drive works. I'll re-run the SCSI2SD utility and track down the internal terminator option.

 

[LaPorta]

I must have misunderstood. I’d have told you about the terminator, but I thought you said the drive didn’t even spin up.

 

[krishnadraws]

No worries @LaPorta. Where might the internal drive's terminator be located at?

 

[LaPorta]

Depends. Usually it is a jumper block attached to two pins. In theory, you should be fine, because the internal drive is configured to allow attachments to the SCSI port of properly terminated. Is the SCSI2SD have it’s termination enabled?

 

[krishnadraws]

Found it!

I removed the TE jumper on the drive (a Quantum Trailblazer). While the machine was open, I took the opportunity to also install a battery holder and add a new CMOS battery. The SCSI2SD has software termination already set. When I reassembled the Mac, it recognized all my drives. The TE jumper had to be removed in order for the Quantum drive to be recognized when the SCSI2SD was connected.