Blu-ray players support 7.1 audio formats and high-quality, lossless surround sound. While your high-def disc player and receiver may be able to decode these new surround sound formats, not all discs you play will take advantage of them.
You can choose to store your files on your Chromebook or online with a cloud-based file storage service like Google Drive. With Google Drive, your data is stored in Google's highly secure data centers. The Terms of Service make clear that what belongs to you stays yours..
The Storage Manager is available in the latest developer version of Chrome OS. Users will need to enable its relevant flag (chrome://flags/#enable-storage-manager) and restart Chrome to access it. The feature will then appear under Chrome Settings > Storage. Hopefully Google's engineers will be adding more functionality in the future.