Disk 0 Partition 1 Meaning ((top)) Page

| Context | Likely Role | Drive Letter | Safe to modify? | |---------|-------------|--------------|------------------| | Boot disk (UEFI) | EFI System Partition | None | ❌ No (breaks boot) | | Boot disk (BIOS/MBR) | System Reserved | None | ❌ No (breaks boot) | | Secondary disk | First data partition | D:, E:, etc. | ✅ Yes | | Clean install media | Temporary / Setup partition | None | ⚠️ Only if recreating layout |