> On 27 Nov, 2018, at 12:25 am, dlewis1...@gmail.com wrote:
> 
> I checked the ID number for either drive and they are distinct; ie “4” versus 
> “6”.

In binary, these IDs differ by only one bit (100, 110).  If there's a loose 
wire between the ID selector and the jumper block on the drive itself - or 
worse, if the selector is disconnected entirely - the drive may be on a 
different ID than shown.

I advise using a SCSI bus scanner to identify which ID each drive is actually 
showing up on.

 - Jonathan Morton

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