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Difference between revisions of "Disk Image Formats"
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<pre>hdiutil convert -format UDZO udrw.dmg -o udzo.dmg</pre> |
<pre>hdiutil convert -format UDZO udrw.dmg -o udzo.dmg</pre> |
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| − | The resulted UDZO Image file can be checked with |
+ | The resulted UDZO Image file can be checked with the asr utility |
| + | |||
| + | <pre>asr -imagescan udzo.dmg</pre> |
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Revision as of 15:30, 15 July 2009
iPhone Firmware (ipsw) files contain .dmg disk images beside other files.
The main filesystem .dmg disk image (the largest .dmg file) is decrypted to an UDZO .dmg disk image.
UDZO Image Format
The UDZO Image is an UDIF zlib-compressed read-only image which can natively be mounted on Mac OS X. UDZO Images can be converted to read/write UDRW Images with the hdiutil on Mac OSX.
hdiutil convert -format UDRW -o udrw.dmg udzo.dmg
UDRW Image Format
The UDRW Image is an UDIF read/write image which can be natively mounted on Mac OS X. UDRW Images can be converted to zlib-compressed read-only UDZO Images with the hdiutil on Mac OSX.
hdiutil convert -format UDZO udrw.dmg -o udzo.dmg
The resulted UDZO Image file can be checked with the asr utility
asr -imagescan udzo.dmg
