lost data/photos

[thetlane]

i recently got an android tablet and i took my sd memory card out of my sidekick 4g and put it into an adapter and then into the droid tablet. when i went to look at my photos on the tablet over half of them were missing. i then put the sd card back into my sidekick and the same thing happened. i am still able to access some of my pictures and videos but atleast 90% of them are gone...does anyone know why this happened or how/if i can recover the lost date? please feel free to respond either on here or at tara.brooke13@gmail.com. thank you in advance for ANY help!