hi i have a hdd samsung
model HD320KJ
serial S0PAJDWPC04783
320 GB SATA

1_ when I connect it does nothing
2_when i turn down start spinning and a repetitive click sounds (i think its the arm or the hsa or r/w head or whatever its named)
3_ when i turn again with the label facing up the click and the spin stop. after some time it start again.
4_ it took like 5 min to be recognized by w7 connected through a usb adapter but dont appear on my pc and sometimes it disconnect and connect again.

my intention is to repair the hard drive but dont know which part is faulty and where to get it

Sounds like one or more bad heads
Repair is not economically feasible

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SAN, NAS, RAID, Server, and HDD Data Recovery.

Replace it.

Or, if you need data from it, refer to a professional (the problem is internal).

ok thanks for answer
can the parts be bought or have to get them from a donor?
exist the same head in other hdd with other model?
exist a compatibility list? i have some others hdd models

Usually when people buy a donor you need to have working parts, like PCB, and maybe heads, there is no list, people buy what they need to fix a problem.

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Data Recovery in the Dominican Republic
https://www.recuperamidata.com/