[leonardo barone]"there is a way for deactivate it ?"
No. These are the waveform files that get displayed on the timeline. I agree it's annoying that Sony leaves these scattered about on your hard drive but they are a necessary evil if you want to see the wave forms and there is no way to deactivate them or place them elsewhere. Feel free to delete them but they will get regenerated the next time you open a project that uses that media. It's just an annoying design.