The capacity of the e-reader is only limited to the size of the storage disk , operating system addressing, and perhaps the memory.
I think a Kindle can hold somewhere around 1500 books.
I'd like to know if the 1500 number is the number of books that are addressable in the directory or just a rough estimate based on the amount of storage.
BTW: Just so everyone knows. I have a Sony and Kindle e-reader. I have a lot of technical material on these but very little in casual reading material.
When a good Windows based tablet computer comes out then I will have one. I want a unit that does both computing and is an e-reader.