Do a "SHOW DEV:DU" and you'll see it - for example, on my 5.7 system: .show dev:du Device Status CSR Vector(s) ------ ------ --- --------- DU Resident 172150 154 150 144 140 DU0: is set PORT = 0, UNIT = 0, PART = 0 DU1: is set PORT = 0, UNIT = 1, PART = 0 DU2: is set PORT = 0, UNIT = 2, PART = 0 DU3: is set PORT = 0, UNIT = 3, PART = 0 DU4: is set PORT = 0, UNIT = 4, PART = 0 DU5: is set PORT = 0, UNIT = 5, PART = 0 DU6: is set PORT = 0, UNIT = 6, PART = 0 DU7: is set PORT = 0, UNIT = 7, PART = 0 D10: is set PORT = 0, UNIT = 8, PART = 0 D11: is set PORT = 0, UNIT = 9, PART = 0 D12: is set PORT = 0, UNIT = 10, PART = 0 D13: is set PORT = 0, UNIT = 11, PART = 0 D14: is set PORT = 0, UNIT = 12, PART = 0 D15: is set PORT = 0, UNIT = 13, PART = 0 D16: is set PORT = 0, UNIT = 14, PART = 0 D17: is set PORT = 0, UNIT = 15, PART = 0 D20: is set PORT = 0, UNIT = 16, PART = 0 D21: is set PORT = 0, UNIT = 17, PART = 0 D22: is set PORT = 0, UNIT = 18, PART = 0 D23: is set PORT = 0, UNIT = 19, PART = 0 D24: is set PORT = 0, UNIT = 20, PART = 0 D25: is set PORT = 0, UNIT = 21, PART = 0 D26: is set PORT = 0, UNIT = 22, PART = 0 D27: is set PORT = 0, UNIT = 23, PART = 0 D30: is set PORT = 0, UNIT = 3, PART = 0 D31: is set PORT = 0, UNIT = 3, PART = 1 D32: is set PORT = 0, UNIT = 3, PART = 2 D33: is set PORT = 0, UNIT = 3, PART = 3 D34: is set PORT = 0, UNIT = 3, PART = 4 D35: is set PORT = 0, UNIT = 3, PART = 5 D36: is set PORT = 0, UNIT = 3, PART = 6 D37: is set PORT = 0, UNIT = 3, PART = 7 D40: is set PORT = 0, UNIT = 4, PART = 0 D41: is set PORT = 0, UNIT = 4, PART = 1 D42: is set PORT = 0, UNIT = 4, PART = 2 D43: is set PORT = 0, UNIT = 4, PART = 3 D44: is set PORT = 0, UNIT = 4, PART = 4 D45: is set PORT = 0, UNIT = 4, PART = 5 D46: is set PORT = 0, UNIT = 4, PART = 6 D47: is set PORT = 0, UNIT = 4, PART = 9 D50: is set PORT = 0, UNIT = 4, PART = 8 D51: is set PORT = 0, UNIT = 4, PART = 9 D52: is set PORT = 0, UNIT = 4, PART = 10 D53: is set PORT = 0, UNIT = 43, PART = 0 D54: is set PORT = 0, UNIT = 44, PART = 0 D55: is set PORT = 0, UNIT = 45, PART = 0 D56: is set PORT = 0, UNIT = 46, PART = 0 D57: is set PORT = 0, UNIT = 47, PART = 0 D60: is set PORT = 0, UNIT = 4, PART = 0 D61: is set PORT = 0, UNIT = 5, PART = 0 D62: is set PORT = 0, UNIT = 6, PART = 0 D63: is set PORT = 0, UNIT = 7, PART = 0 D64: is set PORT = 0, UNIT = 8, PART = 0 D65: is set PORT = 0, UNIT = 9, PART = 0 D66: is set PORT = 0, UNIT = 10, PART = 0 D67: is set PORT = 0, UNIT = 11, PART = 0 D70: is set PORT = 0, UNIT = 4, PART = 1 D71: is set PORT = 0, UNIT = 5, PART = 1 D72: is set PORT = 0, UNIT = 6, PART = 1 D73: is set PORT = 0, UNIT = 7, PART = 1 D74: is set PORT = 0, UNIT = 8, PART = 1 D75: is set PORT = 0, UNIT = 9, PART = 1 D76: is set PORT = 0, UNIT = 10, PART = 1 D77: is set PORT = 0, UNIT = 11, PART = 1 Another thing that helps with keeping tracks of large numbers of partitions is to assign descriptive Volume ID and owner fields to the partitions. For example: .init ld4:/volu LD4:/Initialize; Are you sure? Y Volume ID? junk Owner? me .dir/vol ld4: Volume ID: junk Owner : me 0 Files, 0 Blocks 1986 Free blocks Presumably, you'll find something more useful than "junk" and "me" to fill the fields in with :-) -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927