/dev/srandom vs. /dev/arandom

[James Hozier]

I heard that since 4.9, there has been some changes to the /dev/randoms in 
OpenBSD. I'm unsure of what the changes exactly are, but for confidentiality in 
terms of entire hard drives (talking terabytes of SATAII hard drives), would 
/dev/srandom still be the best suitable for this task? Last I remember, 
/dev/arandom was much too slow since I could not do enough on my computer to 
create enough entropy to randomize my disks before an entire year passed, heh