Clarifications about cylinder size and alignment

master
Thomas Schmitt 12 years ago
parent 7a7f234b69
commit fcd2f36fb8
  1. 18
      xorriso/xorriso.1
  2. 97
      xorriso/xorriso.info
  3. 18
      xorriso/xorriso.texi

@ -9,7 +9,7 @@
.\" First parameter, NAME, should be all caps
.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
.\" other parameters are allowed: see man(7), man(1)
.TH XORRISO 1 "Mar 02, 2011"
.TH XORRISO 1 "Mar 04, 2011"
.\" Please adjust this date whenever revising the manpage.
.\"
.\" Some roff macros, for reference:
@ -2522,18 +2522,22 @@ The offset value of an ISO image gets preserved when a new session is added.
So the value defined here is only in effect if a new ISO image gets written.
.br
\fBpartition_hd_cyl=\fRnumber gives the number of heads per cylinder for
partition offset. 0 chooses a default value.
partition offset. 0 chooses a default value. Maximum is 255.
.br
\fBpartition_sec_hd=\fRnumber gives the number of sectors per head for
partition offset. 0 chooses a default value.
partition offset. 0 chooses a default value. Maximum is 63.
.br
If the product of partition_sec_hd and partition_hd_cyl is too small to
describe the image size by at most 1024 cylinders, then appropriate values
of partition_hd_cyl are chosen with partition_sec_hd 32 or 63.
The product partition_sec_hd * partition_hd_cyl * 512 is the cylinder size.
It should be divisible by 2048 in order to allow exact alignment.
If it is too small to describe the image size by at most 1024 cylinders,
then appropriate values of partition_hd_cyl are chosen with
partition_sec_hd 32 or 63. If the image is larger than 8,422,686,720 bytes,
then the cylinder size constraints cannot be fulfilled.
.br
\fBpartition_cyl_align=\fRmode controls image size alignment to an integer
number of cylinders. It is prescribed by isohybrid specs and it seems to
please program fdisk.
please program fdisk. Cylinder size must be divisible by 2048.
Images larger than 8,323,596,288 bytes cannot be aligned.
.br
Mode "auto" is default. Alignment by padding happens only with
"isolinux" "partition_table=on".

@ -2245,16 +2245,21 @@ filesystem and announced by an MBR partition table entry.
is added. So the value defined here is only in effect if a new
ISO image gets written.
*partition_hd_cyl=*number gives the number of heads per cylinder
for partition offset. 0 chooses a default value.
for partition offset. 0 chooses a default value. Maximum is 255.
*partition_sec_hd=*number gives the number of sectors per head for
partition offset. 0 chooses a default value.
If the product of partition_sec_hd and partition_hd_cyl is too
small to describe the image size by at most 1024 cylinders, then
appropriate values of partition_hd_cyl are chosen with
partition_sec_hd 32 or 63.
partition offset. 0 chooses a default value. Maximum is 63.
The product partition_sec_hd * partition_hd_cyl * 512 is the
cylinder size. It should be divisible by 2048 in order to allow
exact alignment. If it is too small to describe the image size by
at most 1024 cylinders, then appropriate values of
partition_hd_cyl are chosen with partition_sec_hd 32 or 63. If the
image is larger than 8,422,686,720 bytes, then the cylinder size
constraints cannot be fulfilled.
*partition_cyl_align=*mode controls image size alignment to an
integer number of cylinders. It is prescribed by isohybrid specs
and it seems to please program fdisk.
and it seems to please program fdisk. Cylinder size must be
divisible by 2048. Images larger than 8,323,596,288 bytes cannot
be aligned.
Mode "auto" is default. Alignment by padding happens only with
"isolinux" "partition_table=on".
Mode "on" causes alignment by padding with "partition_table=on"
@ -4060,7 +4065,7 @@ File: xorriso.info, Node: CommandIdx, Next: ConceptIdx, Prev: Legal, Up: Top
* -alter_date sets timestamps in ISO image: Manip. (line 146)
* -alter_date_r sets timestamps in ISO image: Manip. (line 166)
* -append_partition adds arbitrary file after image end: Bootable.
(line 197)
(line 202)
* -application_id sets application id: SetWrite. (line 117)
* -as emulates mkisofs or cdrecord: Emulation. (line 13)
* -assert_volid rejects undesired images: Loading. (line 84)
@ -4263,7 +4268,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
* ACL, show in ISO image, -getfacl: Navigate. (line 69)
* ACL, show in ISO image, -getfacl_r: Navigate. (line 76)
* Appendable media, _definition: Media. (line 38)
* Appended Filesystem Image, -append_partition: Bootable. (line 197)
* Appended Filesystem Image, -append_partition: Bootable. (line 202)
* Backslash Interpretation, _definition: Processing. (line 49)
* Backup, enable fast incremental, -disk_dev_ino: Loading. (line 182)
* Backup, enable features, -for_backup: Loading. (line 177)
@ -4281,7 +4286,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
* Closed media, _definition: Media. (line 43)
* Comment, #: Scripting. (line 128)
* Create, new ISO image, _definiton: Methods. (line 6)
* Cylinder alignment, _definiton: Bootable. (line 166)
* Cylinder alignment, _definiton: Bootable. (line 169)
* Cylinder size, _definiton: Bootable. (line 158)
* Delete, from ISO image, -rm: Manip. (line 21)
* Delete, from ISO image, -rm_r: Manip. (line 28)
@ -4376,7 +4381,7 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
* Media, erase, -blank: Writing. (line 45)
* Media, format, -format: Writing. (line 69)
* Media, list formats, -list_formats: Writing. (line 107)
* MIPS boot file, activation: Bootable. (line 173)
* MIPS boot file, activation: Bootable. (line 178)
* mkisofs, Emulation: Emulation. (line 16)
* Modifying, _definition: Methods. (line 27)
* Multi-session media, _definition: Media. (line 7)
@ -4455,8 +4460,8 @@ File: xorriso.info, Node: ConceptIdx, Prev: CommandIdx, Up: Top
* Session, mount command line, -mount_cmd: Inquiry. (line 31)
* Session, mount parameters, -mount_opts: Inquiry. (line 47)
* Session, select as input, -load: Loading. (line 11)
* SUN Disk Label, production: Bootable. (line 184)
* SUN SPARC boot images, activation: Bootable. (line 218)
* SUN Disk Label, production: Bootable. (line 189)
* SUN SPARC boot images, activation: Bootable. (line 223)
* System area, _definiton: Bootable. (line 123)
* Table-of-content, search sessions, -rom_toc_scan: Loading. (line 203)
* Table-of-content, show, -toc: Inquiry. (line 18)
@ -4518,38 +4523,38 @@ Node: Filter79052
Node: Writing83401
Node: SetWrite89690
Node: Bootable103631
Node: Jigdo116588
Node: Charset120846
Node: Exception123597
Node: DialogCtl128112
Node: Inquiry130699
Node: Navigate135076
Node: Verify143016
Node: Restore151605
Node: Emulation158261
Node: Scripting167632
Node: Frontend173194
Node: Examples174489
Node: ExDevices175658
Node: ExCreate176292
Node: ExDialog177566
Node: ExGrowing178828
Node: ExModifying179630
Node: ExBootable180131
Node: ExCharset180678
Node: ExPseudo181506
Node: ExCdrecord182400
Node: ExMkisofs182715
Node: ExGrowisofs183718
Node: ExException184842
Node: ExTime185296
Node: ExIncBackup185755
Node: ExRestore189676
Node: ExRecovery190645
Node: Files191211
Node: Seealso192439
Node: Legal192963
Node: CommandIdx193885
Node: ConceptIdx208192
Node: Jigdo116943
Node: Charset121201
Node: Exception123952
Node: DialogCtl128467
Node: Inquiry131054
Node: Navigate135431
Node: Verify143371
Node: Restore151960
Node: Emulation158616
Node: Scripting167987
Node: Frontend173549
Node: Examples174844
Node: ExDevices176013
Node: ExCreate176647
Node: ExDialog177921
Node: ExGrowing179183
Node: ExModifying179985
Node: ExBootable180486
Node: ExCharset181033
Node: ExPseudo181861
Node: ExCdrecord182755
Node: ExMkisofs183070
Node: ExGrowisofs184073
Node: ExException185197
Node: ExTime185651
Node: ExIncBackup186110
Node: ExRestore190031
Node: ExRecovery191000
Node: Files191566
Node: Seealso192794
Node: Legal193318
Node: CommandIdx194240
Node: ConceptIdx208547

End Tag Table

@ -44,7 +44,7 @@
@c man .\" First parameter, NAME, should be all caps
@c man .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
@c man .\" other parameters are allowed: see man(7), man(1)
@c man .TH XORRISO 1 "Mar 03, 2011"
@c man .TH XORRISO 1 "Mar 04, 2011"
@c man .\" Please adjust this date whenever revising the manpage.
@c man .\"
@c man .\" Some roff macros, for reference:
@ -2994,19 +2994,23 @@ So the value defined here is only in effect if a new ISO image gets written.
@*
@cindex Cylinder size, _definiton
@strong{partition_hd_cyl=}number gives the number of heads per cylinder for
partition offset. 0 chooses a default value.
partition offset. 0 chooses a default value. Maximum is 255.
@*
@strong{partition_sec_hd=}number gives the number of sectors per head for
partition offset. 0 chooses a default value.
partition offset. 0 chooses a default value. Maximum is 63.
@*
If the product of partition_sec_hd and partition_hd_cyl is too small to
describe the image size by at most 1024 cylinders, then appropriate values
of partition_hd_cyl are chosen with partition_sec_hd 32 or 63.
The product partition_sec_hd * partition_hd_cyl * 512 is the cylinder size.
It should be divisible by 2048 in order to allow exact alignment.
If it is too small to describe the image size by at most 1024 cylinders,
then appropriate values of partition_hd_cyl are chosen with
partition_sec_hd 32 or 63. If the image is larger than 8,422,686,720 bytes,
then the cylinder size constraints cannot be fulfilled.
@*
@cindex Cylinder alignment, _definiton
@strong{partition_cyl_align=}mode controls image size alignment to an integer
number of cylinders. It is prescribed by isohybrid specs and it seems to
please program fdisk.
please program fdisk. Cylinder size must be divisible by 2048.
Images larger than 8,323,596,288 bytes cannot be aligned.
@*
Mode "auto" is default. Alignment by padding happens only with
"isolinux" "partition_table=on".

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