Zhanti,
I can't specifically answer your question about selectively loading artwork but I don't think it will save you anything worthwhile. I did do a little checking on my own Zune library (admittedly only 1300 songs). Maybe it will help give you some perspective.
My songs are all the maximum quality allowed by Zune (192 CBR) and take around 5.7mb per song. They all have artwork. If your per-song average is similar then your 3740 songs would occupy approximately 21,400 megs (or about 21 gig.
I did a little checking on artwork (a few songs) and if I remove it I would pick up only 54KB per song. For your 3740 songs, that would be less than 200 MB if every song had artwork. Even at that, you would only pick up space for another 40 songs.
The 7500 songs are based on a 128 variable bitrate and a 3 minute song. Fixed bitrates mean less songs. Higher bitrates mean less. Longer songs mean less. In some respects the number of songs quoted (250 per gig) is unrealistic marketing hype, although technically correct. All of the manufacturers use the 250 number so it''s not a Zune (or Microsoft) thing. Stiil, it isn't very "real world" either.
Hope this helps.
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