boot block การใช้

• After the boot block is the " primary home block ".
• FS only included the boot block, superblock, a clump of inodes, and the data blocks.
• The boot blocks then verify that a suitable rudimentary environment exists, and use it to load the System suitcase.
• A different operating system with a different file system can boot by simply using its own code in the boot blocks.
• Third-party formatting utilities often did not provide the SOS boot block, and some would even mark block 1 available for user data.
• A detection program can look for any of the known decrypt routines on the boot block area of the disk, or alternatively try to blindly brute force decrypt them.
• The boot block contains the disk location and block size of the target primary bootstrap image file, and SRM will load that into memory and will then transfer control to it.
• When an appropriate disk boot device is available, the SRM console locates and loads the target primary bootstrap image using information written in the target disk boot block; in logical block zero.
• On disks with GPT . SYS, GPT . SYS contains the equivalent of the boot block ( known as the Master Boot Record ( MBR ) ), and there is no primary home block.
• Rash, on the other hand, can use the classic " Big Boot Block " move from the original " Battletoads ", where his foot transforms into a massive, spiky boot.
• With the traditional organization, block 1 is the " boot block ", which contains the location of the " primary bootstrap image ", used to load the VMS operating system.
• Sometimes even the platform itself dictated some size restrictions : the size of the boot sector of a floppy disk ( generally 512 to 4096 bytes ) was also the maximum size of a boot block demo.
• The first two versions ( and variants that use the same decrypt routines ), can also be identified as containing an identification word 0xABCD, as the last data on the boot block containing anything but zero values.
• The boot block demos of the 1980s, demos that were created to fit within the small ( generally 512 to 4096 bytes ) first block of the floppy disk that was to be loaded into art form unto itself.
• An example computer system where this technique was not used is the Commodore 64, since it was not designed to read any boot block from external storage media prior to starting operating system routines and entering the BASIC interpreter.
• If the boot block detects any corruption in the main BIOS, it will typically warn the user that a recovery process must be initiated by booting from removable media ( floppy, CD or USB flash drive ) so the user can try flashing the BIOS again.
• Although the " Classic Mac OS " boot process is convoluted and largely undocumented, it is not more limited than an IBM PC compatible BIOS . Like a PC's master boot record, a ROM-based Mac reads and executes code from the first blocks ( " boot blocks " ) of the disk partition selected as the boot device.
• Block 0 is the Apple II boot block and block 1 boots SOS . This allows a disk to be used to boot on either Apple II or Apple III computers by putting both operating system kernels in the top directory : the Apple II boot sector looks for the file PRODOS and the Apple III boot sector looks for the file SOS . KERNEL.
• There is also extra protection from accidental BIOS rewrites in the form of boot blocks which are protected from accidental overwrite or dual and quad BIOS equipped systems which may, in the event of a crash, use a backup BIOS . Also, all modern operating systems such as FreeBSD, Linux, macOS, Windows NT-based Windows OS like Windows 2000, Windows XP and newer, do not allow user-mode programs to have direct hardware access.