Distinguishing SATA disks

[Hendrik Boom <hendrik@topoi.pooq.com>]

I'm currently running an etch system, soon to be updated to Lenny.

I recently installed two identical internal SATA disks and spend a few 
days bad-block testing them.  They passed.

They show up as /dev/sda and /dev/sdb.

As far as I know, these /dev designators are dynamically assigned at boot 
time.  (I've had previous problems with multiple eth devices, solved by 
removing the ones I didn't need).

How can I ensure that the same /dev's are always associated with the same 
physical drives?  Or am I misunderstanding something here and has the 
problem become obsolete?

-- hendrik