bump, please re-up the ringtone. i just heard it today for the first time. thanks
I fixed this on mine and never posted about it. The tone happens when you have replaced your notification tone with something located only on your sdcard, or you accidentaly deleted the stock Droid.ogg, so the tone sounds when it can't access the sdcard (i.e. on first bootup or unplugging from being mounted to your pc).
The way I went about it, was to take the custom tone I use, rename it from .mp3 (or whatever it happens to be) to .ogg, then for simplicity sake, place the .ogg file on the root of your sdcard. Now open terminal emulator;
$su
#mount -o rw,remount -t yaffs2 /dev/block/mtdblock4 /system
#busybox cp -R /sdcard/(tone).ogg /system/media/audio/notifications
#mount -o ro,remount -t yaffs2 /dev/block/mtdblock4 /system
Some ROMs will have a shortform to mount the system (i.e. mountsys, sysmount) it depends on what you are using, but those can save you alot of that typing.
An even easier way to fix this is to just use a stock notification tone... but where is the fun in that
Hope this helps.