.sh ACKNOWLEDGEMENTS This document represents a lot of work. It would have been easier, except for everyone who sent us helpful hints and suggestions and, in general, kept us honest. In particular, we would like to acknowledge all those vendors who were patient with us, especially those whose products were ultimately not included. George Goble at Purdue made several helpful comments which greatly improved the content of the document, and his experiences with Fujitsu Eagles has made a significant impression on us. The DEC DSA engineering team in Colorado Springs, including Paul Massiglia, Bill Grace and Chuck Hess were particularly generous with their time and energies. Peter Weinberger of Bell Laboratories shared his experiences with the UDA50/RA81 with us. Kirk McKusick spent time traveling to Colorado Springs to aid in evaluating the DEC RA81 disk drive. David Mosher has worked diligently as the purchasing agent for CSRG and also contributed to our understanding of the subtler points of disk manufacturing and operation. Jim Reeds gave the paper a careful proof reading and found many oversights. .ds LH "Vendor references .ds CH "- % - .bp .\" Local Section Header .de sh .ne 8 .sp 2 .LP .B .LG .ce 1 \\$1 .R .NL .LP .sp ..