Just want to warn all PSP owners......I just received a "KINGJET" brand Memory stick from an ebay user and even though they stated the card compatible with the PSP....IT IS NOT! I put this card into my psp and the psp says "no memory card inserted" When  I try to format to see if that would help , the psp said "there is no memory card inserted".  I paid nearly $18 for this card and it's a FAKE! or atleast it doesn't work with the psp!  I have also heard that the "Kingjet" brand memory may work temporarily in the psp and then all of a sudden stop working! My computer doesn't even recognize this card! So just a warning for unsuspecting buyers who want to use this card in the psp....DO NOT BUY THIS CARD!  While it may work in other devices.... it WILL NOT WORK IN THE PSP :(