Dominic Giampaolo — who works on the Spotlight and file-system engineering team at Apple — reviews Amit Singh’s Mac OS X Internals: A Systems Approach at Amazon.com:
This book has to be one of the most comprehensive treatments of any operating system ever. I read through the sections with which I am most familiar (file systems, Spotlight and HFS). The level of detail and understanding expressed in those sections is very impressive. I thought I might find some errors or at least niggling details that weren’t quite right but I could not find any.