Please ignore post #2. It's all wrong.
The 505 and 300 show up as removable drives without the need for any extra software. You do not need the Sony software. It's obsolete. As for side loading, you can use Calibre to do that. Calibre is what just about everyone on MR uses to side load. Also, you can easily manage collections with Calibre.
For any questions about Calibre, have a look in the Calibre forum on MR and if you have any questions, ask there.
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