The picture above is of the old but still working 1990 70MB Quantum drive that came with the mac.

I removed the A1 A2 jumpers on it and it indeed started loading System 7.5.5 instantly.

Ozymandias said:

The picture above is of the old but still working 1990 70MB Quantum drive that came with the mac.

I removed the A1 A2 jumpers on it and it indeed started loading System 7.5.5 instantly.

Click to expand...

When the Mac (any SCSI Mac and PCs with SCSI too), the SCSI chip tests each address (0 - 6) for a boot device, with each test about 3 to 5 seconds long. So to get to A6 (jumpers A1 and A2 adding up to A6 in binary), it takes about 18 to 30 seconds. While going to A0 (the first address in the binary chain), goes right there immediately.

I need your help because the new drive I bought still isn't working.

Here is what I get from Apple Personal Diagnostics with the old (above) and the new (below) drives:



No name found for the new one.



Any ideas ?

It is detecting the drives. I dont see what the problem is? 

the IBM drive may need formatted. Also, you will need to change its SCSI ID back to 0, but that wouldnt stop the drive from mounting IF... its formatted correctly.