bootstrap code area

MBR - Master Boot Record

• The first 440 bytes of MBR are the bootstrap code area.
• On BIOS systems it usually contains the first stage of the boot loader.
• The bootstrap code can be backed up, restored from backup or erased using dd.
  #myquestion What do you mean by first stage?

PMBR (Protective Master Boot Record)

• Used for BIOS/GPT booting with boot loaders that support it.

1. https://wiki.archlinux.org/title/Partitioning#Master_Boot_Record_(bootstrap_code)