We installed system software 7.0 on several Macintosh computers to answer this question. For the minimal installs, we chose Customize and then "Minimal Install for..." For the system specific installs, we chose Customize and then installed software configurations for the specific Macintosh.
System software requires about 1593K, averaging Minimal Installs and Full Installs together.
A minimal install placed the following items in the System Folder of a Macintosh SE/30:
| Name | Type | Size |
| Apple Menu Items | (folder) | -- |
| Control Panels (alias) | (file) | 2K |
| Control Panels | (folder) | -- |
| Finder | (file) | 356K |
| System | (file) | 756K |
There are no Extension or Preference folders. The system builds them at startup. The only font that you can see is the Geneva (Italic) 9 used for alias filenames.
Here is a table of differences in disk space needed for Minimal Installs and System Specific Installs (SSI):
| Computer | SSI | Minimal | Difference |
| Macintosh Plus | 2496 | 975 | 1521 |
| Macintosh SE | 2499 | 974 | 1525 |
| Macintosh Classic | 2508 | 974 | 1534 |
| Macintosh SE/30 | 2737 | 1116 | 1621 |
| Macintosh LC | 2670 | 1049 | 1621 |
| Macintosh Portable | 2541 | 971 | 1570 |
| Macintosh II | 2737 | 1116 | 1621 |
| Macintosh IIx | 2737 | 1116 | 1621 |
| Macintosh IIsi | 2669 | 1049 | 1621 |
| Macintosh IIcx | 2737 | 1116 | 1621 |
| Macintosh IIci | 2666 | 1045 | 1621 |
| Macintosh IIfx | 2671 | 1050 | 1621 |