ooo a pretty music device

i got a mp3 player yesterday.... i've been having fun on it all day today... i already have about 200 song stored on it.... and i've only went through 5 of my cds and i got some music from miles computer.... its going to be pretty... the 5 cd's i put on there are my 80's cds....my good ones...damn it....right now im check something on it.. i organised my music on it, an in the program it is organnised... but when i unhook it from the computer and it saved the changes, half the work i did didnt register... this is the 2nd time i've tried... grrr.. but this anime song i got from miles is cool.