I have to hand off a Laptop including its hard disc. Since it was not encrypted I wanted to wipe it at least quickly. I know this is not optimal on SSD, but I thought better than just plain readable.
Now I am running wipe of a live USB stick and it is painfully slow. I wonder why that is. Of course there is hardly anything happening on the computer besides wiping that device, so I imagine entropy could be low (entropy_avail says it is at 1220). Would it be equally good to just call
dd if=/dev/random of=/dev/sda1 bs=1k
four times? Or is there a way I can call something that will increase the randomness? Or is the bottle neck somewhere completely different?