LC II not being able to see two hard drives at the same time

[gkmaia]

I got an LCII with a hard drive inside. 

As I wanted a second hard drive I decided to make an adaptor to connect my other SCSI drive to it's rear SCSI port. 

If I start with the external HD connected it boots from the external Hd and the internal is not visible.

If I start with the internal HD and later connect the external HD the external does not mount.

Anything I should do such as setting the external as slave? Or come pinout on my adapter that I am missing?

 

[cheesestraws]

You would probably be better off with a multi-plug internal SCSI cable.  Make sure that the devices have different SCSI IDs assigned.

 

[MrFahrenheit]

Sounds like either you have the same SCSI I’d for both drives (likely 0) or it’s a termination issue. Have you checked your SCSI bus with something like SCSI Probe ?

 

[Trash80toHP_Mini]

Concur, especially is it sounds like the external was the internal boot drive from another Mac? In that case they'd both be terminated (handy for your external adaptation) and set to SCSI ID0.

 

[Cory5412]

To add: It's a bad idea to connect and disconnect SCSI devices while your system is running.

 

[just.in.time]

To add: It's a bad idea to connect and disconnect SCSI devices while your system is running.

Seconding this. SCSI is not considered hot-pluggagable. You run the risk of cooking the SCSI controller and/or any device on the scsi bus by plugging and unplugging devices while the computer is powered on.

And I agree, sounds like both drives have the same ID. Change the external ID to something else.

 

[gkmaia]

Thanks for all the answers! I will change the IDs and see what happens.

 

[gkmaia]

Changing the ID worked!!! Thanks!

Transferred a bunch of data and the DIY cable did pretty good.

 

[just.in.time]

Glad to hear it's working now