Yes I agree that the investment in a HD instead of DVD "could" be better, my luck with HD is flaky at best. I have cashed in on my HD warranties.
Everything dies eventually, hence the suggestion to keep two copies of the collection
Now the type of encoding is also an interesting factor...but my reason for DVD and MP3 is.....all current and most past DVD/BlueRay players will play MP3 format music.
Kinda-sorta makes sense, I guess, but I personally wouldn't sacrifice quality for that. Also, having to locate CDs/DVDs when you want to hear music? I ain't ever going back to that, proper media players ftw. I still buy
CDs, but that's because I like artwork - if there were some decent DRM-free FLAC shops that also offered nice artwork, I'd consider scrapping the discs entirely.
So if I archive on something that can be played on something a few years from now it is better than trying to match an eide, sata, or ? (future HD format) down the road.
USB is going to be with us for quite a while. Yeah, probably not forever, but optical discs definitely don't
last forever, either. I bet that, in order to be able to read them, you'd need to re-copy DVDs more than once before USB mass storage devices and the NTFS filesystem is no longer readable.
Also, even if you can't tell the difference between 320kbps MP3 and no-quality-lost FLACs today (I'll be honest and admit that I definitely can't on just about anything), who knows what quality audio gear you might purchase in the future? Better not throwing quality away