This was added as a result of the Firmware upgrade, I noticed this immediately. However I always thought this meant "main storage". Hmm but memory stick makes more scene.
For me I have a Secure Disk and All of my collections say either "SD" or "MS". Proir to the upgrade they where either "SD" or blank.
I have created collections using both calibre and SONY eLibrary and both cause the collection to show up with an "MS" if they are created in the main storage space.
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