Thanks Bob, that's good advice. So, before I open my case, I've currently got 3 
SATA drives all the same model, so how do I know which one is plugged into 
which SATA connector on the motherboard? Is there a command I can issue which 
gives identifying info that includes the disk id AND the SATA connector number 
that it is plugged into?

If I type 'format' I get the following info:

# format
Searching for disks...done


AVAILABLE DISK SELECTIONS:
       0. c0d0 <DEFAULT cyl 20007 alt 2 hd 255 sec 63>
          /[EMAIL PROTECTED],0/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL 
PROTECTED],0
       1. c1t0d0 <ATA-WDC WD7500AAKS-0-4G30-698.64GB>
          /[EMAIL PROTECTED],0/pci1043,[EMAIL PROTECTED]/[EMAIL PROTECTED],0
       2. c1t1d0 <ATA-WDC WD7500AAKS-0-4G30-698.64GB>
          /[EMAIL PROTECTED],0/pci1043,[EMAIL PROTECTED]/[EMAIL PROTECTED],0
       3. c2t0d0 <ATA-WDC WD7500AAKS-0-4G30-698.64GB>
          /[EMAIL PROTECTED],0/pci1043,[EMAIL PROTECTED],1/[EMAIL PROTECTED],0
Specify disk (enter its number): ^C
# 

Disks 1, 2, 3 and 3 form my RAIDZ1 pool, but I don't see info relating to the 
SATA connector number (1 to 6, or 0 to 5 perhaps, as I have 6 onboard SATA 
connectors on the motherboard).

And once a disk id (e.g. c1t0d0) is assigned to a disk, is it guaranteed never 
to change?
 
 
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