My experience.
My Hd was directly taken from my old PPC a1200 (a 20Gb IDE Samsung).
Mos mounted all partitions (pfs too :D) perfectly.
Than, wih SCSIconfig, I formatted my old Linux and MacOs partitions to be used with MOS (one little ffs for the boot.img and the other SFS to test SFS natiive speed).
Actually (while I finish to install again all software I nneed) I'm using a lot of old software installed on those partitions and all go really well.
It's Peg Power!