I have the ipod look alike with hacked hard drive, how do i crack it open? that button on the top? how do i do it?

mvpimports. They normally have screws in the sides but on some the screws can be on the back under various labels. If you have no external screws then it most likely has click lock connectors so you will have to gently wedge the player apart with a knife edge or other thin tool. Gently start wedging the player open at a corner and find the points of resistance where the click locks are. be careful though as it is easy to damage or mark this type of case.

try these links may be it will help you
http://www.27dx.com/index.php?option=com_content&task=view&id=64&Itemid=51
http://www.27dx.com/index.php?option=com_content&task=view&id=63&Itemid=51
http://www.27dx.com/index.php?option=com_content&task=view&id=67&Itemid=51
in this last link you can find a small video , may be thats what you want

N.B: if links dont work try them later , thnx!