1. Any files or subdirectories that were already in /media/cdrom are no longer visible, although they still exist on the block device that contained the mount point /media/cdrom.

2. Bootf is a small FAT12 floppy Bootloader for protected mode OS images Gujin is a GPLed Bootloader for the PC GRUB is a huge, bloated Grand Unified Bootloader, used by many OSes BOOTBOOT for booting 64 bit kernels on BIOS, UEFI, El Torito CDROM etc