Looking for High Sierra

Some time ago, I thought it would be useful to understand exactly what is the difference between CD-ROMs recorded in the old High Sierra format versus the ISO 9660 standard. This was in part spurred by the fact that I have a number of CD-ROMs/images that use the High Sierra format (Microsoft Programmer’s Library, some IBM Developer Connection issues, OS/2 Warp 4, and more) that both macOS and Windows 10 refuse to mount. The other part of my motivation was the usual insatiable curiosity.

I had no idea about the existence of this different format.


  1. 2021-11-01 9:02 pm
    • 2021-11-02 12:03 am
      • 2021-11-02 5:57 am
  2. 2021-11-02 12:43 am
    • 2021-11-02 5:58 am
      • 2021-11-02 9:09 am
    • 2021-11-03 7:17 pm