http://en.wikipedia.org/wiki/Apple_Disk_Image
just a quick refresher on these fileformats
"for the purposes of getting mac os 9 install files to newbies with only X installed..."
we often see .img + .dmg + .smi
but maybe some of us are uneducated on that these formats are actually different versions of the same thing
which is "apple disk images"
these are not seperate standards.. they are the same thing!!
creating an .img file on mac os 9 is very easy and can be done with the application "Disk Copy" from within the utilities folder under applications folder
creating a .dmg file on mac os x is very easy and can be done with "disk utility" from within the utilities folder under applications folder
whats the difference between these two formats? NOTHING!
except that .dmg files have more support for different filesystem formatting options
transfering files between x + 9 can be done MOST SAFELY + MOST EFFECTIVELY
by using this method.. creating .img on mac os 9 using disk copy and then transfering the .img file from mac os 9 to a mac os x disk
this encapsulates + retains all proper file meta data such as resource forks icons associations etc
going from 9 to X at least..
im not so sure this is possible to go backwards from .dmg on X to 9
i had made some post about a rare version of disk copy that was able to mount .dmg files on mac os 9
so i beleive it is possible to go backwards as well providing you have updated your disk copy version to this
rare + hard to find version
i think we found this file.... i will take a look and post a link to the other thread!
but i think it will work (mounting .dmg from X on mac os 9) as long as this .dmg file frm X is using a compatible file system (mac os standard or extended) (denoted above as ***)
but this would be the best and most safe way to transfer files NATIVELY between X + 9
this is the "apple version of stuffit"
this is why apple dropped stuffit from mac os x tiger because they wanted people to use disk images + not use stuffit anymore
^^ from the above article.. has anyone ever tried to make a disk copy .img file and actually move the file to another pc and change file to .iso + burn it?? it seems that .img .dmg .iso are all similar formats!!!!!!?? or has anyone tried to change a .toast file to a .img file (from 9) and click to mount (on x) ?
just a quick refresher on these fileformats
"for the purposes of getting mac os 9 install files to newbies with only X installed..."
we often see .img + .dmg + .smi
but maybe some of us are uneducated on that these formats are actually different versions of the same thing
which is "apple disk images"
these are not seperate standards.. they are the same thing!!
creating an .img file on mac os 9 is very easy and can be done with the application "Disk Copy" from within the utilities folder under applications folder
creating a .dmg file on mac os x is very easy and can be done with "disk utility" from within the utilities folder under applications folder
whats the difference between these two formats? NOTHING!
except that .dmg files have more support for different filesystem formatting options
Quote
What's the difference between .img and .dmg disk images?
They are similar, and you can use either with Mac OS X.
One difference is .dmg disk images can be formatted in one of these formats:
-Mac OS Extended (HFS Plus) ***
-Mac OS Extended Journaled
-Mac OS Standard (HFS) ***
-UFS
-MS-DOS ***
While .img disk images can be formatted as:
-Mac OS Extended (HFS Plus) ***
-Mac OS Standard (HFS) ***
-MS-DOS ***
-ProDOS
-Universal Disk Format.
*** denotes fileformat that is in both .img + .dmg standards!
original article here -- http://support.apple.com/kb/ht1611
transfering files between x + 9 can be done MOST SAFELY + MOST EFFECTIVELY
by using this method.. creating .img on mac os 9 using disk copy and then transfering the .img file from mac os 9 to a mac os x disk
this encapsulates + retains all proper file meta data such as resource forks icons associations etc
going from 9 to X at least..
im not so sure this is possible to go backwards from .dmg on X to 9
i had made some post about a rare version of disk copy that was able to mount .dmg files on mac os 9
so i beleive it is possible to go backwards as well providing you have updated your disk copy version to this
rare + hard to find version
i think we found this file.... i will take a look and post a link to the other thread!
but i think it will work (mounting .dmg from X on mac os 9) as long as this .dmg file frm X is using a compatible file system (mac os standard or extended) (denoted above as ***)
but this would be the best and most safe way to transfer files NATIVELY between X + 9
this is the "apple version of stuffit"
this is why apple dropped stuffit from mac os x tiger because they wanted people to use disk images + not use stuffit anymore
Quote
types of disk image formatsoriginal article -- http://support.apple.com/kb/PH5866
read/write Choose this if you want to continue adding files to the disk image after it’s created. sparse bundle disk image Choose this if you want to continue adding files to the image and want to conserve space. The disk image is just large enough to hold the files in it and expands to its maximum size as you add files to it. For example, if you create a 100 MB sparse bundle disk image, its maximum size is 100 MB. (This format replaces sparse disk image.) read-only Choose this If you don’t need to add more files to the disk image. compressed Choose this if you don’t need to add more files to the image and want to conserve space. The data is compressed, so the disk image is smaller than the original data. CD/DVD master Choose this if you want to use the disk image with a third-party application. The disk image contains a copy of all sectors of the disk, whether they’re used or not, and copies them to other CDs or DVDs exactly as they’re stored in the disk image.
Quote
what is a .img file?
A Macintosh disk image file is a mirror copy of the Mac file system and can be mounted on a computer as a virtual hard disk drive. These Macintosh disk image files can also be used as virtual optical drives like DVD and CD drives. Mac OS 9 and older versions are integrated with support for using and mounting these Macintosh disk image files. These Macintosh disk image files are saved in the IMG format and are affixed with the .img extension. These IMG files are also stored with encoding specifications and implemented with file compression standards proprietary to Apple. Similar to ISO files, an IMG file can sometimes be changed to an ISO file by simply replacing the .img extension with the .iso extension, and doing this will allow a user to use the IMG file with an image mounting program developed for Microsoft Windows-based systems. Mac OS X is also implemented with support for opening and using these IMG files, though newer disk image file formats are now widely used by associated applications programmed for Mac platforms.
original article -- http://www.reviversoft.com/file-extensions/img
^^ from the above article.. has anyone ever tried to make a disk copy .img file and actually move the file to another pc and change file to .iso + burn it?? it seems that .img .dmg .iso are all similar formats!!!!!!?? or has anyone tried to change a .toast file to a .img file (from 9) and click to mount (on x) ?