I keep seeing this talk of BDROM versions of the DVD material.
If you really want all of the SD eps in one easily accessible location to watch on a whim, you can extract the episodes fairly easily from your DVDs. Put them onto a hard drive (USB say) in VOB format and watch all of them from there. Each episode is about 2GB so figure on around 350GB of space. Of course this "little" project will take hours of repetitive labor, but it is worth it in the end IMO.
Optical disks are obsolete. Hard drives are cheap.