Hello,
There is a known problem with the print Queue.  If you have a printer connected to the USB port for sharing, that is.  The system occasionally leaves a spooled print job in the Queue requiring the disk to keep spinning.  
The quickest fixes is to use Windows to view the root dir of the Volume_1 file system.  In Windows explorer make sure you have "tools-folder options-view" with the SHOW HIDDEN FILES AND FOLDERS CHECKED so you can see "hidden" files.  After that you should see a .lpr directory.  Delete that directory (it won't hurt anything) it will recreate itself next boot.  Unplug the printer and reboot the box.
That should fix it.
-G