most any hammer will smash hard drive platters to fragments. when you truly want to destroy any reasonable chance of data recovery. cheapest/best way to disassemble, then smash disc platter.
data recovery is a function of how $$ someone wants to throw at it.
now onwards to topic of which axe... along with chainsaws, I really like axes. racing axes aside, state of the art for axes occurred long ago.
slew of antique axes available. made considerably better than most new axes. if you want the best, choices are boutique axe makers from Sweden, Germany etc. Or one can find an early 1900's American axe by makers like True Temper, Plumb, Keen Kutter, etc. a good axe was an essential tool of any early American farm.
Fiskar makes Gerber axes. either are an excellent low cost choice for a nice axe.
here's a pic of a Keen Kutter axe head found on ebay. re-handled with a nice hickory handle. aprox. $35 invested in this beauty. a new axe of equal quality from a boutique tool maker would be closer to $150+.
http://www.fine-tools.com/grans.htm