Dale K. St. Amant. Using Dual Copy for Prime Shift DASD Hardware Maintenance. In Leo F. Zimmerman, John P. Pilch, Linda J. Carroll, Mark Sorkin, Daniel Kaberon, Doug McBride, Frank M. Bereznay, Dale Doolittle, Joel Goldstein, Dave Thorn, Harry Zimmer, Ellen E. Robertson, Peggy De Rossett, Bernard Domanski, Philip Clark, Robert L. Morrison, Edgar A. Ortiz, editors, 17th International Computer Measurement Group Conference, Nashville, TN, USA, December 9-13, 1991, Proceedings. pages 650-654, Computer Measurement Group, 1991.