sandisk Extreme 60mb/s 16 gb UDMA

earlier today i bought this card from best buy.  Before using I formatted the card on my canon 5d mk ii.  about 100 or so shots in the card froze (i think) and wouldnt work any more.  I restarted my camera and took out the card and re hooked everything one at a time.  The card still wouldnt work, it woulnt even  let me shoot, it kept saying “busy” then after  a minute it would say “Card can not be formatted”

i tried data rescue and disk warrior and not even the CF card will mount on anything, am I missing something ??? Please help!!!