File Structures cover
File Structures
by Michael J. Folk, Bill Zoellick
ISBN: 0201557134
Buy on Amazon
Found in 1 comment on Hacker News
narag · 2022-09-24 · Original thread
Sorry if it's dated. I had this at college (a long long time ago):

https://www.amazon.com/File-Structures-2nd-Michael-Folk/dp/0...

It was very good, describing b-trees and its variants.