I thought put your HCSD into the card slot of MacBook Pro should be everything auto?
I did that with my Nikon D60 photos, no problem... wondering D300s can or not...
I am using early 2008 mbp, I don't have SD card slot on mbp. Anyway, I transfer the photos from D300s to a XP laptop first and copy the files to a thumbdrive and finally copy to mbp. Its not my mbp, it's belong to my wife, I am a 4 years old Dell laptop.