Bootloader

Bootloader image
Bootloader is the small program that runs when a machine starts up and loads the operating system. On an encrypted disk it also asks for the passphrase needed to unlock the drive.

So what? Bootloader errors can be misleading: a simple typo can look like a hardware failure.

Example: The GRUB bootloader doesn’t show characters as a passphrase is typed. So a mistyped password produces “access denied” and drops into rescue mode, which looks like a dead hard drive.
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