Page 1 of Toshiba SD-210e loading noise

I have just received my Tosh 210e and in general I am really happy with the performance. Even MP3s and SVCD`s play perfectly. Please can any one tell me is it normal for the machine to make whirring noises when loading disks. Once the disk is loaded only a quiet spinning noise can be heard during really quiet times. Is it normal for some disks to make a louder spinning noise when playimg than others.
Sorry if this sounds neurotic, but I would be grateful if other owners can let me know if this is normal and doesn`t mean the machine is going to pack up!!!!