It just sounds dirty, perhaps on the drive motor shaft. You will have to open it up give everything a good gentle clean. Check there are no hairs tangle up in it.
Otherwise try and consult an Amiga user in person and let them have a look at it.
btw. Guru meditation is the amiga way of reporting an error. It's usually a result of a software error. Or in your case a corrupted diskette boot sector. Or because the read head is so dirty.
