Donor Drive Samsung 2.5'' HM321HI

[athlesi7]

Hi!
i have a Samsung HM321HI with a head problem.
my drive had 2 heads.
i found the same model but didnt work (it has four heads)
so i suppose the part number has to do with it. so here it goes:

Samsung HM321HI (320GB/5400rpm/8M)
P/N : 33931-G72A-A9LPL
Also has some chinese and then SEC-HM321HI(B)
and then 2010.01

thank you in advance

[athlesi7]

do you know another hard drive market so i can look for these drives?
thank you