[MarjaE]

What is a good way to maintain the disks of the older Kindles?

Because of compatibility issues, speed issues, and space issues I often need to (a) test different versions of pdf files, to see which ones work, which ones freeze, and which ones crash and (b) swap files to avoid using up all the disk space.

Will fragmentation slow down the disk? Will frequent swapping damage the disk? In either case, what are viable maintenance options?

I try to keep a selection of fiction, most of the relevant sources for ongoing research, pubmed articles which may relate to my chronic illness, and some other interesting articles, and rules and articles for some games I'm looking into, all available. That requires a lot of triage.

I currently use either Ghostscript or Willus's k2pdfopt to pre-process pdfs. I am trying to find the best balance for readability and reliability and speed.

I currently use Calibre to export files. I use a virtual library of books to export, and mark them as "incompatible," "read," "wait," or "extra," if I don't plan to export them. But it's a crude system and doesn't allow finer-grained priorities.