any way to control disk order?

[mcforum]

My poor old system died, and I resurrected it by moving the disks to an older 
system. For who knows what reason, the kernel has decided to call the external 
USB drive I use for backups /dev/sda (the old system called it /dev/sdc).  My 
internal sata disks are being called /dev/sdb and /dev/sdc.  This screws with 
things like hddtemp where you have to give it args like /dev/sda /dev/sdb.  I 
don't suppose there is any available mechanism for forcefully inducing the 
kernel to enumerate removable drives last? .................
Plug it in after booting.