The copyright of the official BSD daemon images is held by Marshall Kirk McKusick (a very early BSD developer who worked with Bill Joy).
More recently, he implemented soft updates, an alternative approach to maintaining disk integrity after a crash or power outage, in FFS, and a revised version of UFS known as "UFS2".
Marshall Kirk McKusick, computer scientist, brother of James C. McKusick
Marshall Kirk McKusick, then a Berkeley graduate student, optimized the BSD 4.2's FFS (Fast File System) by inventing cylinder groups, which break the disk up into smaller chunks, with each group having its own inodes and data blocks.
Marshall Kirk McKusick and George V. Neville-Neil, The Design and Implementation of the FreeBSD Operating System (Boston: Addison-Wesley, 2004), ISBN 0-201-70245-2, pp.
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