MCD-900 vibrations problems while reading dvds

[Rise]

Goodmorning,

I have a MCD-900 in warranty and I have this problem:

When it reads a dvd/divx, it makes a vibration sound from the reader, that make my desktop to vibrate too.

But this noise disappear EVERYTIME that i go forward in the tracks/chapters of the dvd.

It means that in the beginning of the movie/concert, it make this noise but changing forward the tracks it DISAPPEAR.

Usually is: 1-2-3 tracks NOISE / 4-5-6, ect., QUIET (only normal round of the disc inside).

I would like to know if this is a mechanical normal thing, or if i shoud take it to the assistance.

Thanks

[lucas1970]

My advise is to let it be checked