Updated documentation about MBR
This commit is contained in:
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83216597c2
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@ -378,7 +378,12 @@ xorriso is able to create or maintain an El Torito object which makes such
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an image bootable. For details see option -boot_image.
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.br
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It is possible to make ISO images bootable from USB stick or other
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hard-disk-like media by -boot_image argument system_area= .
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hard-disk-like media by -boot_image argument system_area= . This installs
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a Master Boot Record which may get adjusted according to the needs
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of GRUB resp. ISOLINUX.
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An \fBMBR\fR contains boot code and a partition table. It does not hamper
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CDROM booting. The new MBR of a follow-up session can get in effect
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only on overwriteable media.
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.br
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Emulation -as mkisofs supports the example options out of the ISOLINUX wiki.
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It also supports the options used in GRUB script grub-mkrescue.
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@ -2245,9 +2250,6 @@ the very start of the ISO image.
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This System Area is reserved for system dependent boot software, e.g. an MBR
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which can be used to boot from USB stick or hard disk.
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.br
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Special disk_path "/dev/zero" causes 32k of NUL-bytes.
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Use this to discard an MBR which eventually was loaded with the ISO image.
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.br
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Other than a El Torito boot image, the file disk_path needs not to be added
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to the ISO image.
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.br
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@ -2257,13 +2259,23 @@ to the ISO image.
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446 to 511 of the System Area.
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.br
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With type "isolinux" it shows a partition that begins at byte 0 and it causes
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the boot image LBA to be written into the MBR. This works only if also
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"system_area=" and "bin_path=" or "dir=" is given.
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the boot image LBA to be written into the MBR. For the first session this
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works only if also "system_area=" and "bin_path=" or "dir=" is given.
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.br
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With types "any" and "grub" it shows a single
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partiton which starts at byte 512 and ends where the ISO image ends.
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This works with or without system_area= or boot image.
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.br
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In follow-up sessions the existing System Area is preserved by default.
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If types "isolinux" or "grub" are set to "patch", then "partition_table=on"
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is activated without new boot image.
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In this case the existing System Area gets checked whether it bears addresses
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and sizes as if it had been processed by "partition_table=on". If so,
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then those parameters get updated when the new System Area is written.
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.br
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Special "system_area=/dev/zero" causes 32k of NUL-bytes.
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Use this to discard an MBR which eventually was loaded with the ISO image.
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.br
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.TP
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.B Character sets:
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.PP
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@ -3131,7 +3143,7 @@ same name and hardcoded argument "on", e.g. -acl "on".
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Explicit arguments are expected by --stdio_sync
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and --scdbackup_tag.
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.br
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--sort-weight gets as argument a number and an iso_rr_path.
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--sort-weight gets as arguments a number and an iso_rr_path.
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The number becomes the LBA sorting weight of regular file iso_rr_path or
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of all regular files underneath directory iso_rr_path.
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(See -find -exec sort_weight).
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@ -337,7 +337,11 @@ Most bootable GNU/Linux CDs are equipped with ISOLINUX or GRUB boot
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images. xorriso is able to create or maintain an El Torito object
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which makes such an image bootable. For details see option -boot_image.
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It is possible to make ISO images bootable from USB stick or other
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hard-disk-like media by -boot_image argument system_area= .
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hard-disk-like media by -boot_image argument system_area= . This
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installs a Master Boot Record which may get adjusted according to the
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needs of GRUB resp. ISOLINUX. An *MBR* contains boot code and a
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partition table. It does not hamper CDROM booting. The new MBR of a
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follow-up session can get in effect only on overwriteable media.
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Emulation -as mkisofs supports the example options out of the ISOLINUX
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wiki. It also supports the options used in GRUB script grub-mkrescue.
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The support for other boot image types is sparse.
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@ -2004,20 +2008,27 @@ of the existing sessions, unless one can assume overwriteable media.
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disk file to the very start of the ISO image. This System Area is
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reserved for system dependent boot software, e.g. an MBR which can
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be used to boot from USB stick or hard disk.
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Special disk_path "/dev/zero" causes 32k of NUL-bytes. Use this
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to discard an MBR which eventually was loaded with the ISO image.
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Other than a El Torito boot image, the file disk_path needs not to
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be added to the ISO image.
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-boot_image isolinux system_area= implies "partition_table=on".
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"partition_table=on" causes a simple partition table to be written
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into bytes 446 to 511 of the System Area.
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With type "isolinux" it shows a partition that begins at byte 0
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and it causes the boot image LBA to be written into the MBR. This
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works only if also "system_area=" and "bin_path=" or "dir=" is
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given.
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and it causes the boot image LBA to be written into the MBR. For
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the first session this works only if also "system_area=" and
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"bin_path=" or "dir=" is given.
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With types "any" and "grub" it shows a single partiton which
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starts at byte 512 and ends where the ISO image ends. This works
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with or without system_area= or boot image.
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In follow-up sessions the existing System Area is preserved by
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default. If types "isolinux" or "grub" are set to "patch", then
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"partition_table=on" is activated without new boot image. In this
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case the existing System Area gets checked whether it bears
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addresses and sizes as if it had been processed by
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"partition_table=on". If so, then those parameters get updated
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when the new System Area is written.
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Special "system_area=/dev/zero" causes 32k of NUL-bytes. Use this
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to discard an MBR which eventually was loaded with the ISO image.
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File: xorriso.info, Node: Charset, Next: Exception, Prev: Bootable, Up: Options
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@ -2806,7 +2817,7 @@ programs trigger comparable actions.
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xorriso options with the same name and hardcoded argument "on",
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e.g. -acl "on". Explicit arguments are expected by --stdio_sync
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and --scdbackup_tag.
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--sort-weight gets as argument a number and an iso_rr_path. The
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--sort-weight gets as arguments a number and an iso_rr_path. The
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number becomes the LBA sorting weight of regular file iso_rr_path
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or of all regular files underneath directory iso_rr_path. (See
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-find -exec sort_weight).
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@ -3787,7 +3798,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
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[index ]
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* Menu:
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* ACL, _definiton: Extras. (line 32)
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* ACL, _definiton: Extras. (line 36)
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* ACL, control handling, -acl: Loading. (line 128)
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* ACL, set in ISO image, -setfacl: Manip. (line 73)
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* ACL, set in ISO image, -setfacl_list: Manip. (line 100)
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@ -3889,6 +3900,8 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
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* Insert, piece of data file, -cut_out: Insert. (line 126)
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* iso_rr_path, _definition: Insert. (line 7)
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* List delimiter, _definiton: Processing. (line 8)
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* MBR, _definiton: Extras. (line 26)
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* MBR, set, -boot_image system_area=: Bootable. (line 85)
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* MD5, control handling, -md5: Loading. (line 141)
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* Media, erase, -blank: Writing. (line 45)
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* Media, format, -format: Writing. (line 69)
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@ -3918,6 +3931,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
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* Ownership, global in ISO image, -uid: SetWrite. (line 125)
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* Ownership, in ISO image, -chown: Manip. (line 42)
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* Ownership, in ISO image, -chown_r: Manip. (line 47)
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* Partition table, _definiton: Bootable. (line 92)
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* Pathspec, _definition: SetInsert. (line 120)
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* Pattern expansion, _definition: Processing. (line 22)
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* Pattern expansion, for disk paths, -disk_pattern: Insert. (line 31)
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@ -3968,6 +3982,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
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* Session, mount command line, -mount_cmd: Inquiry. (line 31)
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* Session, mount parameters, -mount_opts: Inquiry. (line 47)
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* Session, select as input, -load: Loading. (line 11)
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* System area, _definiton: Bootable. (line 85)
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* Table-of-content, search sessions, -rom_toc_scan: Loading. (line 189)
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* Table-of-content, show, -toc: Inquiry. (line 18)
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* Timestamps, set in ISO image, -alter_date: Manip. (line 146)
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@ -3997,7 +4012,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
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* Write, predict image size, -print_size: Inquiry. (line 69)
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* Write, set speed, -speed: SetWrite. (line 145)
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* Write, simulation, -dummy: SetWrite. (line 185)
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* xattr, _definiton: Extras. (line 46)
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* xattr, _definiton: Extras. (line 50)
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* xattr, control handling, -xattr: Loading. (line 136)
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* xattr, set in ISO image, -setfattr: Manip. (line 110)
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* xattr, set in ISO image, -setfattr_list: Manip. (line 126)
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@ -4015,50 +4030,50 @@ Node: Media6089
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Node: Methods8519
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Node: Drives11066
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Node: Extras14332
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Node: Processing17463
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Node: Dialog20959
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Node: Options22616
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Node: AqDrive24184
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Node: Loading27090
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Node: Insert39525
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Node: SetInsert47882
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Node: Manip56449
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Node: CmdFind64325
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Node: Filter73572
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Node: Writing77921
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Node: SetWrite84210
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Node: Bootable94342
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Node: Charset99988
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Node: Exception102742
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Node: DialogCtl107257
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Node: Inquiry109602
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Node: Navigate113742
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Node: Verify121096
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Node: Restore129516
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Node: Emulation136172
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Node: Scripting142858
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Node: Frontend148420
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Node: Examples149621
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Node: ExDevices150790
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Node: ExCreate151272
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Node: ExDialog152546
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Node: ExGrowing153808
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Node: ExModifying154610
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Node: ExBootable155111
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Node: ExCharset155658
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Node: ExPseudo156486
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Node: ExCdrecord157380
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Node: ExMkisofs157695
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Node: ExGrowisofs158698
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Node: ExException159822
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Node: ExTime160276
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Node: ExIncBackup160735
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Node: ExRestore164207
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Node: ExRecovery165176
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Node: Files165742
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Node: Seealso166780
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Node: Legal167304
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Node: CommandIdx168226
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Node: ConceptIdx181527
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Node: Processing17736
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Node: Dialog21232
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Node: Options22889
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Node: AqDrive24457
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Node: Loading27363
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Node: Insert39798
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Node: SetInsert48155
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Node: Manip56722
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Node: CmdFind64598
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Node: Filter73845
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Node: Writing78194
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Node: SetWrite84483
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Node: Bootable94615
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Node: Charset100726
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Node: Exception103480
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Node: DialogCtl107995
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Node: Inquiry110340
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Node: Navigate114480
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Node: Verify121834
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Node: Restore130254
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Node: Emulation136910
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Node: Scripting143597
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Node: Frontend149159
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Node: Examples150360
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Node: ExDevices151529
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Node: ExCreate152011
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Node: ExDialog153285
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Node: ExGrowing154547
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Node: ExModifying155349
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Node: ExBootable155850
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Node: ExCharset156397
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Node: ExPseudo157225
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Node: ExCdrecord158119
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Node: ExMkisofs158434
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Node: ExGrowisofs159437
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Node: ExException160561
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Node: ExTime161015
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Node: ExIncBackup161474
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Node: ExRestore164946
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Node: ExRecovery165915
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Node: Files166481
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Node: Seealso167519
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Node: Legal168043
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Node: CommandIdx168965
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Node: ConceptIdx182266
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End Tag Table
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@ -505,25 +505,20 @@ Most bootable GNU/Linux CDs are equipped with ISOLINUX or GRUB boot images.
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xorriso is able to create or maintain an El Torito object which makes such
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an image bootable. For details see option -boot_image.
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@*
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@cindex MBR, _definiton
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It is possible to make ISO images bootable from USB stick or other
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hard-disk-like media by -boot_image argument system_area= .
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hard-disk-like media by -boot_image argument system_area= . This installs
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a Master Boot Record which may get adjusted according to the needs
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of GRUB resp. ISOLINUX.
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An @strong{MBR} contains boot code and a partition table. It does not hamper
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CDROM booting. The new MBR of a follow-up session can get in effect
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only on overwriteable media.
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@*
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Emulation -as mkisofs supports the example options out of the ISOLINUX wiki.
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It also supports the options used in GRUB script grub-mkrescue.
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@*
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The support for other boot image types is sparse.
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@*
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@c
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@c >>> isohybrid MBR generation has been disabled on request
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@c >>> of its inventor H. Peter Anvin on 31 Mar 2010
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@c
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@c An MBR is generated together with the El Torito boot record if the
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@c boot image bears the isohybrid signature of ISOLINUX 3.72 or later.
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@c It will occupy the first 512 bytes of the emerging ISO image and
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@c enable booting from media which appear as hard disk rather than
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@c as CDROM. An MBR does not hamper CDROM booting. The MBR of a
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@c follow-up session can get in effect only on overwriteable media.
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@c
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@c man .PP
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@sp 1
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@cindex ACL, _definiton
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@ -2700,36 +2695,40 @@ is given by "any" "bin_path=". "boot_info_table=off" disables patching.
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"patch" applies boot info table patching if an existing boot image gets copied
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to a new location.
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@*
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@cindex System area, _definiton
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@cindex MBR, set, -boot_image system_area=
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"system_area="disk_path copies at most 32768 bytes from the given disk file to
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the very start of the ISO image.
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This System Area is reserved for system dependent boot software, e.g. an MBR
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which can be used to boot from USB stick or hard disk.
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@*
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Special disk_path "/dev/zero" causes 32k of NUL-bytes.
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Use this to discard an MBR which eventually was loaded with the ISO image.
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@*
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Other than a El Torito boot image, the file disk_path needs not to be added
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to the ISO image.
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@*
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-boot_image isolinux system_area= implies "partition_table=on".
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@*
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@cindex Partition table, _definiton
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"partition_table=on" causes a simple partition table to be written into bytes
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446 to 511 of the System Area.
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@*
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With type "isolinux" it shows a partition that begins at byte 0 and it causes
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the boot image LBA to be written into the MBR. This works only if also
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"system_area=" and "bin_path=" or "dir=" is given.
|
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the boot image LBA to be written into the MBR. For the first session this
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works only if also "system_area=" and "bin_path=" or "dir=" is given.
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@*
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With types "any" and "grub" it shows a single
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partiton which starts at byte 512 and ends where the ISO image ends.
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This works with or without system_area= or boot image.
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@*
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@c
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@c Bootspec "isohybrid=off" disables MBR generation, "isohybrid=on"
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@c prevents the write session if not the isohybrid signature is found
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@c in the bin_path file. Default is "isohybrid=auto" which silently
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@c omits the MBR if the signature is missing.
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@c
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In follow-up sessions the existing System Area is preserved by default.
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If types "isolinux" or "grub" are set to "patch", then "partition_table=on"
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is activated without new boot image.
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In this case the existing System Area gets checked whether it bears addresses
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and sizes as if it had been processed by "partition_table=on". If so,
|
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then those parameters get updated when the new System Area is written.
|
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@*
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Special "system_area=/dev/zero" causes 32k of NUL-bytes.
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Use this to discard an MBR which eventually was loaded with the ISO image.
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@*
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@end table
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@c man .TP
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@c man .B Character sets:
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@ -3765,7 +3764,7 @@ same name and hardcoded argument "on", e.g. -acl "on".
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Explicit arguments are expected by @minus{}@minus{}stdio_sync
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and @minus{}@minus{}scdbackup_tag.
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@*
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@minus{}@minus{}sort-weight gets as argument a number and an iso_rr_path.
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@minus{}@minus{}sort-weight gets as arguments a number and an iso_rr_path.
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The number becomes the LBA sorting weight of regular file iso_rr_path or
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of all regular files underneath directory iso_rr_path.
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(See -find -exec sort_weight).
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@ -3779,8 +3778,6 @@ For MBR bootable ISOLINUX images there is -isohybrid-mbr FILE, where
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FILE is one of the Syslinux files mbr/isohdp[fp]x*.bin . Use this
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instead of -G to apply the effect of -boot_image isolinux partition_table=on.
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@*
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@c Quite special is isolinux_mbr= (see -boot_image isolinux isohybrid=).
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@c @*
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Personalites "@strong{xorrisofs}", "@strong{genisoimage}",
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and "@strong{genisofs}" are aliases for "mkisofs".
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@*
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