What are the bands/albums you are trying to seed, and how many? If you are trying to seed to raise your reputation score, I'd suggest downloading the discographies of some of the most popular/well-known artists (Metallica, Megadeth, Slayer, etc.), as well as for the major sub-genres (Prog, Death, Black, etc.). Downloading these fairly large discographies from well known artists should give you a decent seed ratio over a large period of time. For quicker seeding with lower impact to storage space, you can download the newest uploads. These are usually single album uploads that seed quickly at first, but over the period of a few days to a week are largely forgotten and can be deleted to recover space.