To format an HD-20SC drive using an Apple II, it's usually best to use System
Disk 3.0. System Utilities 2.1.1 can be used for this purpose only with some
versions of the Apple IIe, as described below.
- Apple IIGS: requires System Disk 3.0. (System Utilities 2.1.1 won't do it.)
- Unenhanced Apple IIe: is not compatible with System Disk 3.0. (Use System
Utilities 2.1.1.)
- Apple IIe (Platinum) with Rev C logic board: use System Disk 3.0 to format
an HD-20SC. (System Utilities 2.1.1 won't do it.)
- Apple IIe (Platinum) with Rev E logic board: it's advisable to use System
Disk 3.0. System Utilities 2.1.1 can be used, but you'll see flashing
garbage on the screen that will make it look like the system has crashed.