Everything is alright, NAND Flasher 360 doesn't know about slims yet, however it works just fine with them. As for the bad blocks, they get remapped when you dump the nand, so you shouldn't worry. Just follow the tutuorial and you'll be ok.
EDIT: also, even you have a nand dump with bad blocks...
Hey there, just used this tutorial to hack a WD3200BPVT with the HDDSS320.bin and HDDHackr v1.30, worked like a charm, so thanks a lot InsaneNutter. I was just wondering, is there any chance that I may use my old 20GB Hitachi HTS541640J9SA00 x360 HDD in a PC? Is there any way to format it to...