Start service menu BM5
connect new USB HHD
Start; Windows Explorer E:\BM-Share\Music; make a new directory (f.e. 3Tb_HHD);must be empty!
Start; Admistratieve Tools; Computer Management; Disk Management;
choose right mouse click on USB HHD; Change Drive Letter and Path...
choose Add...
choose Mount in the follow empty NFTS folder;
click Browse.. and find the created folder (in this example: E:\BM-Share\Music\3Tb_HHD); OK; OK
eventually adjust the virusscanner
Exit Service Menu
you can use the additional directory 3Tb_HDD (=USB_HHD) as additional storage.