Q: Migration

Hi, which way do you mean? From the newer to the older? no. From the older to the newer, mostly.

What OSX version are you trying to migrate to, & from what?

10.3 has no MA.

Correct, but you can clone the 10.5.8 drive to the 10.3 drive, therby having it all at once.

How to use FireWire target disk mode...

http://support.apple.com/kb/HT1661

http://en.wikipedia.org/wiki/Target_Disk_Mode

Put the 10.3 one in t mode.

Get carbon copy cloner to make an exact copy of your 10.5 HD to the 10.3 one...

http://www.bombich.com/software/ccc.html

Or SuperDuper...

http://www.shirt-pocket.com/SuperDuper/

OK, great news, thanks... & please let us know the outcome!