I (now) keep my TBR books on the SD card. It has the
room , so why not

. I keep 2 catalogs in the Main storage. 1)My Paper Library. 2)My e-Library
But since Calibre Companion, I like that catalog view better
I am a
moody reader. It is not unusual for me to have a dozen different books
in progress. What I read depends on my mood at the moment.