Hmm..not sure, but it wasn't White Coat...White Coat is by a Harvard med student who eventually chose pediatrics, and overall is written quite positively, especially considering some of the others I've read...unless there's more than one book with that title? I suppose it's possible; there's about a dozen with a variation of "Do No Harm" as the title.
I'll try to find out for you; meanwhile, this would be a great place to post our recommendations of books detailing the med school and residency experience. I'm reading every one I can and think they're cruical in preparing you for the worst, so that you can make the best of the experience. The more you know, the better off you'll be. I think the most negative experiences are directly related to the sudden death of over-developed idealisms. I'll post my own list here soon.