Actually, it's more like 50 hard drives without redundancy (keeping in mind TiB vs TB) and at least double that if we're talking quality redundancy (assuming this is a for-profit company hosting people's sound clips then they better have duplicates of everything).
I don't know enough about their model and what services they provide though. I'm thinking 40TB a year storage, but ~100TB transfer per month or more - which isn't a little.
But my biggest point is future expansion. 40TB in year one... how many in year 2?
I have to admit I don't know anything about operating in those dimensions (ianaa - I am not an admin). But HD capacities are growing fast - maybe faster than the data needs of that company? So perhaps they would not have to buy more and more hard drives, only replace the old ones with bigger ones?
All hypothetical, though - personally I think I would go for something like S3.
I don't know enough about their model and what services they provide though. I'm thinking 40TB a year storage, but ~100TB transfer per month or more - which isn't a little.
But my biggest point is future expansion. 40TB in year one... how many in year 2?