ISO 9660 - Revision history

Jsummers: /* Software */

2024-12-02T14:54:36Z

‎Software

Jsummers at 18:03, 18 December 2021

2021-12-18T18:03:09Z

Jsummers: /* See also */

2021-12-18T17:45:48Z

‎See also

Jsummers: /* Software */

2020-07-22T14:41:16Z

‎Software

Jsummers: /* Software */

2019-02-26T16:44:01Z

‎Software

Jsummers: /* Extensions */

2019-02-18T15:07:03Z

‎Extensions

Jsummers: /* Format details */

2019-02-18T15:04:34Z

‎Format details

Jsummers: /* Extensions */

2019-02-07T17:01:30Z

‎Extensions

Jsummers: /* Extensions */

2019-02-05T19:13:17Z

‎Extensions

Jsummers: /* Identification */

2019-02-03T16:10:23Z

‎Identification

@@ Line 100: / Line 100: @@
 * [https://www.libarchive.org/ libarchive] → bsdtar
 * [[The Unarchiver]]
 === Other ===

@@ Line 5: / Line 5: @@
 |mimetypes={{mimetype|application/x-iso9660-image}}
 |kaitai struct=iso9660
 }}
 '''ISO 9660''' is a read-only [[filesystem]] often used on [[CD-ROM|CD-ROMs]]. It is also common to encounter files containing an [[ISO image|image]] of an ISO 9660 filesystem.

@@ Line 83: / Line 83: @@
 == See also ==
 * [[ISO image]]
 * [[Universal Disk Format]] (UDF) - A successor to ISO 9660
 * Hybrids of [[Apple Partition Map]] and ISO 9660 are common.

@@ Line 97: / Line 97: @@
 * [[7-Zip]], [http://unix.stackexchange.com/questions/70738/what-is-the-fastest-way-to-extract-an-iso see here for an example]
 * [https://www.libarchive.org/ libarchive] → bsdtar
 === Other ===

@@ Line 93: / Line 93: @@
 == Software ==
-=== Reading ===
+=== Decoding ===
 * [[7-Zip]], [http://unix.stackexchange.com/questions/70738/what-is-the-fastest-way-to-extract-an-iso see here for an example]
 * [http://linux.die.net/man/1/isoinfo isoinfo] can perform basic operations and some validation.
 * [https://www.gnu.org/software/libcdio/ libcdio] (<code>iso-info</code>, <code>iso-read</code>, ...)
-* Operating systems often include drivers for ISO 9660. On Linux, an ISO 9660 image file can be mounted using a loopback driver (<code>mount -t iso9660 -o loop ...</code>).
+* Operating systems often have filesystem drivers for ISO 9660. On Linux, an ISO 9660 image file can be mounted using a loopback driver (<code>mount -t iso9660 -o loop ...</code>).
 * [https://github.com/KBNLresearch/isolyzer isolyzer] is a tool that verifies if the file size of an ISO image is consistent with the information in its filesystem-level headers. This can be useful for detecting incomplete (e.g. truncated) ISO images. Apart from ISO 9660, isolyzer also supports UDF, HFS and HFS+, as well as hybrids of all of these filesystems.
+* cdrkit ([[Wikipedia:Cdrkit|Wikipedia article]]) (genisoimage, wodim, etc.)
-=== Writing ===
+* [http://cdrtools.sourceforge.net/private/cdrecord.html Cdrtools] (mkisofs, cdrecord, etc.)
-* [http://www.cdrkit.org/ cdrkit] → genisoimage
+* [https://dev.lovelyhq.com/libburnia/web/wikis/home libburnia] (xorriso, etc.)
-* Countless CD burning applications
 == Links ==
 * [[Wikipedia: ISO 9660]]

@@ Line 68: / Line 68: @@
 SUSP/Rock Ridge "{{magic|ZF}}" signature.
-=== Mkisofs transparent compression ===
+=== isofs transparent compression ===
-Main article: [[mkisofs transparent compression]]
+Main article: [[isofs transparent compression]]
 SUSP/Rock Ridge "{{magic|ZZ}}" signature.
 === RISC OS extensions ===
-Main article: [[ARCHIMEDES ISO 9660 extension]].
+Main article: [[ARCHIMEDES ISO 9660 extension]]
 Signature "{{magic|ARCHIMEDES}}" in directory record system use area.

@@ Line 9: / Line 9: @@
 == Format details ==
 The standard specifies a very limited filename format. At its strictest interchange level, it only allows DOS-style "8.3" names, uppercase only. At less strict levels, filenames can be up to 31 characters. Several extensions, mainly [[Rock Ridge]] and [[Joliet]], were developed to mitigate these limitations.
 The filenames also have a VMS-style version number, so sometimes they are shown with a ";1" suffix.
 The size of a file is limited to 4GB (2GB in some implementations). This is irrelevant with respect to CD-ROMs, because of their small capacity, but it is a reason to avoid using ISO 9660 on [[DVD-ROM|DVD-ROMs]] and other media. (A feature called "multiple extents" makes larger files possible, but support for it may be limited.)

@@ Line 46: / Line 46: @@
 Signature "{{magic|AA}}" or "{{magic|BA}}" in directory record system use area. "AA" is SUSP/Rock Ridge-like.
 === Amiga extensions ===
-SUSP/Rock Ridge extension.
+SUSP/Rock Ridge "{{magic|AS}}" signature.
 * [http://www.estamos.de/makecd/Rock_Ridge_Amiga_Specific Amiga "AS" extension]
@@ Line 71: / Line 68: @@
 === RISC OS extensions ===
 Signature "{{magic|ARCHIMEDES}}" in directory record system use area.

@@ Line 30: / Line 30: @@
 === Rock Ridge ===
 Main article: [[Rock Ridge]]
 === Joliet ===
@@ Line 38: / Line 40: @@
 === CD-ROM XA ===
-"{{magic|CD-XA001}}" signature in volume descriptor, offset 1024.
+Main article: [[CD-ROM XA]]
 === Apple extensions ===
-Signature "{{magic|AA}}" or "{{magic|BA}}" in directory record system use area.
+Main article: [[Apple ISO 9660 extensions]]
 * [[Wikipedia: Apple ISO 9660 Extensions]]
@@ Line 47: / Line 51: @@
 === Amiga extensions ===
 * [http://www.estamos.de/makecd/Rock_Ridge_Amiga_Specific Amiga "AS" extension]
 === zisofs extensions ===

@@ Line 16: / Line 16: @@
 == Identification ==
-Usually, the ASCII string "{{magic|CD001}}>" appears at offset 32769.
+For the usual ISO 9660 image file format, the ASCII string "{{magic|CD001}}" appears at offset 32769, and also 2048 bytes later at offset 34817.
 The first 32768 bytes are not used. Be aware that hybrid filesystems are possible. Just because something is a valid ISO 9660 image, doesn't mean it can't also be a valid file of some other type.