it allows u to transfer files deep inside the jailbroken device that won't normally show up in the ipod unless u have a file manager... like of u have safari download manager and download a file off safari.. say an mp3.. it won't show up in the normal ipod but can be played via safari... it also won't show in itunes... so disk aid is handy to remove it if thy wishes...
thanks I will have a look at your link