ps2 network adapter- - -again!!!

Could someone please tell me ---are all adapters the same?? Do they all have ports which accomodate a HDD? i,m saying this because i saw one in a shop for £16.99 and asked the geezer behind the counter if you could fit a HDD to it,he looked blank and said its for online gaming,the box was sealed so i couldnt get a look at the other side of it,any thoughts would be greatly appreciated --thanks!!

otherwise i'll have to get the bloke to open the pack so i can inspect it.

sounds to me matey dont know shit bout ps2 lol as far as i am aware ps2 network addaptors are all the same so yes it supports a hd :o