astralbijectioncurl > /dev/sda: How I made a Linux distro that runs wget | dd
From the article:
> The OS may stop you from unmounting /dev/sda1, but it won’t stop you from writing to /dev/sda1 or /dev/sda even if there’s something mounted!
Not always true. There's a kernel config option that allows it. CONFIG_BLK_DEV_WRITE_MOUNTED