The minimum requirement for the HD 20 Startup disk is a System Folder with System 4.1, Finder 5.5, and Hard Disk 20 1.1 in it.An external 800K floppy drive (attached to the Hard Disk 20) is required for installation, unless you have some other way of moving files from 800K disks to 400K disks.The System and Finder on the HD 20 Startup disk must be the same as the System and Finder on the Hard Disk 20, i.e., System 4.1 Finder 5.5.On a Macintosh 512K with a Hard Disk 20 hard drive: The System Tools disk is now the startup disk.Start an application from the System Tools disk.Insert the System Tools disk into the external 800K floppy drive.Use the HD 20 Startup disk to boot the machine.On a Macintosh 512K with an external 800K floppy drive: Macintosh Utilities 2 (v2.1) (August 1987).Macintosh Utilities 1 (v2.1) (August 1987).Macintosh System Tools (v2.0.1) (June 1987).System 4.1 Finder 5.5, released April 1987 Printer Installation (v1.1) This is not a direct image of the original disk created on 'Wed, Jun 4, 1986, 3:32 PM.' This is a copy of its contents, complete and unaltered.System 3.2 Finder 5.3, released June 1986 MacWrite 4.5 and MacPaint 1.5 were the current versions for more than two years. The System Update disk was sent to dealers, for distribution to Macintosh owners. System 2.0 Finder 4.1, released April 1985 This is the first solid Mac Software release, three months after the original Macintosh shipped with what was essentially a public beta release. Minimum recommended OS for the Macintosh 128K and 512K. System 1.1 Finder 1.1g, released May 1984 Avoid handling them on Windows, as it will strip the resource fork from the archive. If you are using Disk Copy to make floppy disks, don't expand the archives until they reach the machine you will use to make the disks. In Mac OS X 10.7 and above, The Unarchiver can extract them for use in Mini vMac or via Floppy Emu. You can download Stuffit Expander at MacFixer.

Note: These Disk Copy 4.2 disk images* are stored inside early Stuffit 3 (.sit) archives, which can be extracted by Stuffit Expander 3.5 (and above) in System 6 (and above). The disks are complete and the files are unaltered. These are Apple's recommended releases for machines with 128K and 512K of memory.

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