Its "cool" but not very profitable. I bought a 4tb HDD for gaming and i checked the profitability, is very bleh. It really does not compare to just buying proper hardware. I'm guessing the coin isint too used since its been around for quite a while and its almost unheard of.
Yeah I don´t realy do it for the profitability... I just want to see where this coin will go because of its concept... also my PC is on 24/7 anyways so it doesnt realy matter if my external HDD jumps on from time to time then goes back to sleep...

If you're leaving your PC on 24/7, then that would be a possibility to earn more Burst. A 3.5 external HDD would be more reliable and faster than a 2.5 laptop HDD. Still, if you're curious about knowing how much Burst you would mine, I suggest you visit this page:
http://burstcoin.biz/calculator Have fun!

2$ per month for my 300$ HDD. Not a very good investment. Also i didn't check what the proof of capacity actually do, but if it put any use on the HDD, its really not worth the 24$ at current rate over one year.