At least 8GB of space (16GB is recommended for better compatibility).
This is a BIOS issue. When you turn on the broken PC, you must enter the BIOS/UEFI settings (usually by pressing F2, F10, or Delete). windows 11 recovery usb download for another pc
If the built-in Windows tools cannot fix the issue (for example, if the file system is RAW or the partition table is corrupted), you may need a dedicated rescue environment created by third-party software. At least 8GB of space (16GB is recommended