Interesting. Right now I have around 570 books on the Sony of which about 200 on a MemoryStick (I have found MS performs better than SD, but this might be observer bias). I've had up to 1000-1500 before the Sony started acting up. I've seen reports of people loading as many as
4000 books, although that takes some tweaking. Also, if your Sony ever has to rebuild its internal database with that many books, it is likely the battery runs out before it finishes.
I use Calibre exclusively to load books, and it strikes me there are many ways that books can be loaded:
- using the Sony 2.0 library
- using the Sony 3.0 library
- dragging and dropping using a file manager
- using Calibre
Perhaps mixing these methods up is a bad idea; I am not sure. Like I said, I use only Calibre to manage my books (in fact, two Calibre installs, one on my main linux machine at home and one on my windows work PC) and I have never had any of the problems you describe. I did have them when I first got the reader, when I used a mixture of drag 'n drop, Sony, and Calibre. Then again, at that time I was also experimenting and fiddling around a lot. As people do when they have a new shiny
edit: one afterthought - what format are these books? Are they all the same format?