Something that always bugged me, was the speed of the /dev/urandom device, which provides random data. I needed it to benchmark some network devices and urandom just wasn't fast enough for that :-D
Anyway, openssl provides also a way to generate some random data, which is much faster ...

I've just been playing around with a QNAP TS-639 Pro, and apparently it wasn't able anymore to boot from the internal 'DOM' (disk on module). First try to 'flash' a firmware update available on their website failed.. Why...? Looks like they're encrypted by default, so useless if ...