size of a handy cluster ?

after many tries of compressing my jar-file sizes (especially for the magic 64k limit) a question came up my mind:

how large is a handy cluster ? is this model specific ?
if its e.g. 4kb it would be pretty large steps in relation to a max jar file size of 64kb …

uhm - whats a handy cluster?

;D
after i read the post myself i noticed that my question isnt too good too understand.

i talk about the filesysstem and want to know the size of the littelest data unit on a handy storage (the internal memory).

like the common size of 4kbyte for a ntfs cluster.

i didnt want to talk about handy cluster systems for distributed computing … =))