Wang and Taratorin present the best technical overview of magnetic recording I have seen to date. What I found especially valuable is the extensive discussion of both the characteristics and measurement of the principal non-linearities impacting magnetic recording. These include such things as non-linear transition shift, hard-easy transition shift, MR assymetries, and self erasure. The books focus is on the recording/playback processes, but also includes a reasonable introduction to coding and partial response channel design. For readers who want more details on the codes used historically, Mee and Daniel's works are better.