hey, i haven't been on here in a while, but i just ran into a bit of a strange issue, i searched this site and google, but i wasn't even sure how to search. posting here is something of a final resort. it's not a huge issue, but it's curious.

i have an 8GB kingston sd card, and two lexar card readers. Card reader A is only an sd card reader, and card reader B is a multi card reader for about any card i can find. The sd card will not show up on my macbook, or my girlfriends ibook when it is in reader A. However a micro sd card reader (that is an sd card which i put into reader A) it works fine, and reader A works with the sd card on a windows vista machine. If I use reader B everything works fine on all computers.

I can get the info off of the card via reader B, so it's no big deal, but like what the heck? any ideas?