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Disk Copy was Apple's disk image creation and mounting tool that shipped with Mac OS starting from 1988 (System 6) up to 2002 (OSX 10.2). The last version released is beta but works fine, especially that it could mount and allow editing of Mac OS X uncompressed .DMG disk image files under Mac OS 9.1 or later.
This download includes the following versions of DiskCopy:
DiskCopy 4.2: For use with System 6.
DiskCopy 6.3.3: This version shipped with Mac OS 9.0. It supports .IMA, .IMG files, but *not* .DMG files.
DiskCopy 6.4: This is an Apple internal release and can mount/edit uncompressed/unencrypted OSX .DMG disk images.
DiskCopy 6.5b13: Altough a beta version, this was the final release of Disk Copy. It supports .DMG and .CDR formats and requires Mac OS 9.1 or later (up to OSX 10.2).
Note: The functionality of Disk Copy 6.3 and later can be extended with a series of scripts which were made available directly from Apple. Look in the downloads section to find them. Here is the description of the scripts taken from Apple's website:
Disk_Copy_(v6.5b13).sit (715.49 KiB / 732.66 KB)
Disk Copy v6.5b13 (2002) (requires Mac OS 9.1 or later up to OSX 10.2)
424 / 2016-07-12 / 2016-07-12 / e4089a1830ed82888c983b7736d77c76de71a96c
Disk_Copy_(v6.3.3).sit (1.19 MiB / 1.25 MB)
Disk Copy v6.3.3 (1999)
654 / 2016-07-12 / 2016-07-12 / 5fb29c01c1e4178099adde37ac52b55cba53dd92
DiskCopy_6.0.sit (29.73 KiB / 30.44 KB)
Disk Copy v6.0 (1994)
355 / 2016-07-12 / ea257f333d2f6846a0326eb92712ce5ba576390b
Disk_Copy_(v4.2).sit (15.3 KiB / 15.67 KB)
Disk Copy v4.2 (1994)
751 / 2016-07-12 / 2016-07-12 / 8fd1b1faa3233dae7fdb20307758a2f0349caaef
Disk_Copy_6.3_Scripts.smi.sit (142.86 KiB / 146.29 KB)
Apple Scripts for Disk Copy v6.3 or later
53 / 2016-07-12 / f613faaf8cc86918f22364d9bbb2c793a429b897
DiskCopy_6.4.sit (668.42 KiB / 684.46 KB)
Disk Copy v6.4 / Apple internal release (2001)
281 / 2016-07-12 / 6b463c5aa428214f522e66c181065231eb700815
Architecture: 68K for all versions except v6.4 and v6.5b13 which are PPC only.
DiskCopy 4.2 runs on Mac OS 6.x
DiskCopy 6.0 runs on Mac OS 7.x
DiskCopy 6.3.3 runs on Mac OS 7.x
DiskCopy 6.4 requires Mac OS 8.5.1 or later.
DiskCopy 6.5b13 requires Mac OS 9.1 and can run on up to Mac OS X 10.2
Emulating this? It should run fine under: Mini vMac