Dumping GDR's using Dreamshell and DC SD adapter help

[Superrayman3]

I'm a noob when it comes to Dreamshell so any help would be appreciated I need to know how to use dreamshell to dump gdrs to my SD card I tried using the ripgdr function in dreamshell but I have no clue what i'm supposed to do to get it to work (and don't say swap the disk for a gdr after selecting that funtion cause that doesn't work) any ideas on what I need to do?