jffs2 minimum mtd block size

[mike]

Dear all
    I want to ask about minimum mtdblock size which jffs2 need . Why i 
ask is because i try to make a 128kbyte mtdblock for my system status 
storage, it fails. And i repartition to 1MB, it consumes the flash 
nearly 600KB without any data.
    Am i do something wrong? or there is a minimum size for jffs2.
    If it is, Could i conclude that jffs2 do not suit to store small 
size of data. And which filesystem expertise can suggest me for this 
purpose?

best regard
mike,lee