strong clicks from the hd

[Ivan <darthxiong@libero.it>]

hi all, i have a pismo with debian testing/macos9 . since the first 
installation, 5 months ago, the hd sometimes makes a strong click, only 
with linux. During heavy hd usage, like rebuilds of htdig, slocate, 
ecc, i can hear 4-5 clicks in a minute, but usually are only 4-5 in a 
day. Is this a thing to worry about? ( e.g. clicks will soon kill the 
hd? )
TIA and sorry for my english (TM :-)
  
-- 
   (@_  Ivan Fabris, S.Sofia (FC) Powered by Linux Debian 2.2 r3  _*)
   //\      www.darthxiong.net   setiathome.ssl.berkeley.edu      /\\
   V_/_     www.folug.linux.it   pgp key @ www.keyserver.net     _\_V