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Clarifications about cylinder size and alignment

This commit is contained in:
Thomas Schmitt 2011-03-04 10:46:40 +00:00
parent 7a7f234b69
commit fcd2f36fb8
3 changed files with 73 additions and 60 deletions
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18
xorriso/xorriso.1
View File

@ -9,7 +9,7 @@
.\" First parameter, NAME, should be all caps .\" First parameter, NAME, should be all caps
.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
.\" other parameters are allowed: see man(7), man(1) .\" 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. .\" Please adjust this date whenever revising the manpage.
.\" .\"
.\" Some roff macros, for reference: .\" 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. So the value defined here is only in effect if a new ISO image gets written.
.br .br
\fBpartition_hd_cyl=\fRnumber gives the number of heads per cylinder for \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 .br
\fBpartition_sec_hd=\fRnumber gives the number of sectors per head for \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 .br
If the product of partition_sec_hd and partition_hd_cyl is too small to The product partition_sec_hd * partition_hd_cyl * 512 is the cylinder size.
describe the image size by at most 1024 cylinders, then appropriate values It should be divisible by 2048 in order to allow exact alignment.
of partition_hd_cyl are chosen with partition_sec_hd 32 or 63. 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 .br
\fBpartition_cyl_align=\fRmode controls image size alignment to an integer \fBpartition_cyl_align=\fRmode controls image size alignment to an integer
number of cylinders. It is prescribed by isohybrid specs and it seems to 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 .br
Mode "auto" is default. Alignment by padding happens only with Mode "auto" is default. Alignment by padding happens only with
"isolinux" "partition_table=on". "isolinux" "partition_table=on".

97
xorriso/xorriso.info
View File

@ -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 is added. So the value defined here is only in effect if a new
ISO image gets written. ISO image gets written.
*partition_hd_cyl=*number gives the number of heads per cylinder *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_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 The product partition_sec_hd * partition_hd_cyl * 512 is the
small to describe the image size by at most 1024 cylinders, then cylinder size. It should be divisible by 2048 in order to allow
appropriate values of partition_hd_cyl are chosen with exact alignment. If it is too small to describe the image size by
partition_sec_hd 32 or 63. 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 *partition_cyl_align=*mode controls image size alignment to an
integer number of cylinders. It is prescribed by isohybrid specs 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 Mode "auto" is default. Alignment by padding happens only with
"isolinux" "partition_table=on". "isolinux" "partition_table=on".
Mode "on" causes alignment by padding with "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 sets timestamps in ISO image: Manip. (line 146)
* -alter_date_r sets timestamps in ISO image: Manip. (line 166) * -alter_date_r sets timestamps in ISO image: Manip. (line 166)
* -append_partition adds arbitrary file after image end: Bootable. * -append_partition adds arbitrary file after image end: Bootable.
(line 197) (line 202)
* -application_id sets application id: SetWrite. (line 117) * -application_id sets application id: SetWrite. (line 117)
* -as emulates mkisofs or cdrecord: Emulation. (line 13) * -as emulates mkisofs or cdrecord: Emulation. (line 13)
* -assert_volid rejects undesired images: Loading. (line 84) * -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: Navigate. (line 69)
* ACL, show in ISO image, -getfacl_r: Navigate. (line 76) * ACL, show in ISO image, -getfacl_r: Navigate. (line 76)
* Appendable media, _definition: Media. (line 38) * 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) * Backslash Interpretation, _definition: Processing. (line 49)
* Backup, enable fast incremental, -disk_dev_ino: Loading. (line 182) * Backup, enable fast incremental, -disk_dev_ino: Loading. (line 182)
* Backup, enable features, -for_backup: Loading. (line 177) * 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) * Closed media, _definition: Media. (line 43)
* Comment, #: Scripting. (line 128) * Comment, #: Scripting. (line 128)
* Create, new ISO image, _definiton: Methods. (line 6) * 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) * Cylinder size, _definiton: Bootable. (line 158)
* Delete, from ISO image, -rm: Manip. (line 21) * Delete, from ISO image, -rm: Manip. (line 21)
* Delete, from ISO image, -rm_r: Manip. (line 28) * 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, erase, -blank: Writing. (line 45)
* Media, format, -format: Writing. (line 69) * Media, format, -format: Writing. (line 69)
* Media, list formats, -list_formats: Writing. (line 107) * 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) * mkisofs, Emulation: Emulation. (line 16)
* Modifying, _definition: Methods. (line 27) * Modifying, _definition: Methods. (line 27)
* Multi-session media, _definition: Media. (line 7) * 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 command line, -mount_cmd: Inquiry. (line 31)
* Session, mount parameters, -mount_opts: Inquiry. (line 47) * Session, mount parameters, -mount_opts: Inquiry. (line 47)
* Session, select as input, -load: Loading. (line 11) * Session, select as input, -load: Loading. (line 11)
* SUN Disk Label, production: Bootable. (line 184) * SUN Disk Label, production: Bootable. (line 189)
* SUN SPARC boot images, activation: Bootable. (line 218) * SUN SPARC boot images, activation: Bootable. (line 223)
* System area, _definiton: Bootable. (line 123) * System area, _definiton: Bootable. (line 123)
* Table-of-content, search sessions, -rom_toc_scan: Loading. (line 203) * Table-of-content, search sessions, -rom_toc_scan: Loading. (line 203)
* Table-of-content, show, -toc: Inquiry. (line 18) * Table-of-content, show, -toc: Inquiry. (line 18)
@ -4518,38 +4523,38 @@ Node: Filter79052
Node: Writing83401 Node: Writing83401
Node: SetWrite89690 Node: SetWrite89690
Node: Bootable103631 Node: Bootable103631
Node: Jigdo116588 Node: Jigdo116943
Node: Charset120846 Node: Charset121201
Node: Exception123597 Node: Exception123952
Node: DialogCtl128112 Node: DialogCtl128467
Node: Inquiry130699 Node: Inquiry131054
Node: Navigate135076 Node: Navigate135431
Node: Verify143016 Node: Verify143371
Node: Restore151605 Node: Restore151960
Node: Emulation158261 Node: Emulation158616
Node: Scripting167632 Node: Scripting167987
Node: Frontend173194 Node: Frontend173549
Node: Examples174489 Node: Examples174844
Node: ExDevices175658 Node: ExDevices176013
Node: ExCreate176292 Node: ExCreate176647
Node: ExDialog177566 Node: ExDialog177921
Node: ExGrowing178828 Node: ExGrowing179183
Node: ExModifying179630 Node: ExModifying179985
Node: ExBootable180131 Node: ExBootable180486
Node: ExCharset180678 Node: ExCharset181033
Node: ExPseudo181506 Node: ExPseudo181861
Node: ExCdrecord182400 Node: ExCdrecord182755
Node: ExMkisofs182715 Node: ExMkisofs183070
Node: ExGrowisofs183718 Node: ExGrowisofs184073
Node: ExException184842 Node: ExException185197
Node: ExTime185296 Node: ExTime185651
Node: ExIncBackup185755 Node: ExIncBackup186110
Node: ExRestore189676 Node: ExRestore190031
Node: ExRecovery190645 Node: ExRecovery191000
Node: Files191211 Node: Files191566
Node: Seealso192439 Node: Seealso192794
Node: Legal192963 Node: Legal193318
Node: CommandIdx193885 Node: CommandIdx194240
Node: ConceptIdx208192 Node: ConceptIdx208547
 
End Tag Table End Tag Table

18
xorriso/xorriso.texi
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@ -44,7 +44,7 @@
@c man .\" First parameter, NAME, should be all caps @c man .\" First parameter, NAME, should be all caps
@c man .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection @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 .\" 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 .\" Please adjust this date whenever revising the manpage.
@c man .\" @c man .\"
@c man .\" Some roff macros, for reference: @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 @cindex Cylinder size, _definiton
@strong{partition_hd_cyl=}number gives the number of heads per cylinder for @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 @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 The product partition_sec_hd * partition_hd_cyl * 512 is the cylinder size.
describe the image size by at most 1024 cylinders, then appropriate values It should be divisible by 2048 in order to allow exact alignment.
of partition_hd_cyl are chosen with partition_sec_hd 32 or 63. 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 @cindex Cylinder alignment, _definiton
@strong{partition_cyl_align=}mode controls image size alignment to an integer @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 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 Mode "auto" is default. Alignment by padding happens only with
"isolinux" "partition_table=on". "isolinux" "partition_table=on".