MassStorage process eats my cpu

Hi,
since i installed 10.4.8, my system has been behaving in a strange way. Iphoto now recognizes my firewire mass storage (160 gb hard disk on an enclosure) unit as a camera... and i notice that the MassStorage process (as i see it in activity monitor) get to use 30% or 50% of Cpu (intel imac 17 inch), until it gets stuck "not responding" and it goes up to 80%. After i kill the process, everything goes back to normal. The thing is, i use the storage devide very much, and even when the system starts i see it eating my cpu.
how can i resolve this? is there any known workaround? i dont think it is a normal behaviour, its been happening since yesterday.
Thanks in advance.
Alberto Rojas

Ok, so spotlight indexed my hard drive again, and i let massstorage to finish its work. I know the process is directly related to the indexing process, but i cant make it stop. The indexing setting is set to off (through terminal) but it keeps working everytime i restart, even in the admin account in my mac, and even after the process is finished. There has to be a workaround, im still looking around for answers.
thank you very much for your help.
Alberto.

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