Burning SGI *.img files onto CDROM using OS X

                    'c.          ehowton@Mac-mini.local 
                 ,xNMM.          ---------------------- 
               .OMMMMo           OS: macOS Catalina 10.15.5 19F101 x86_64 
               OMMM0,            Host: Macmini8,1 
     .;loddo:' loolloddol;.      Kernel: 19.5.0 
   cKMMMMMMMMMMNWMMMMMMMMMM0:    Uptime: 1 day, 21 hours, 51 mins 
 .KMMMMMMMMMMMMMMMMMMMMMMMWd.    Packages: 34 (brew) 
 XMMMMMMMMMMMMMMMMMMMMMMMX.      Shell: zsh 5.7.1 
;MMMMMMMMMMMMMMMMMMMMMMMM:       Resolution: 1920x1080
:MMMMMMMMMMMMMMMMMMMMMMMM:       DE: Aqua 
.MMMMMMMMMMMMMMMMMMMMMMMMX.      WM: Quartz Compositor 
 kMMMMMMMMMMMMMMMMMMMMMMMMWd.    WM Theme: Blue (Light) 
 .XMMMMMMMMMMMMMMMMMMMMMMMMMMk   Terminal: /dev/ttys000 
  .XMMMMMMMMMMMMMMMMMMMMMMMMK.   CPU: Intel i7-8700B (12) @ 3.20GHz 
    kMMMMMMMMMMMMMMMMMMMMMMd     GPU: Intel UHD Graphics 630 
     ;KMMMMMMMWXXWMMMMMMMk.      Memory: 19824MiB / 65536MiB 
       .cooc,.    .,coo:.

% hdiutil attach -nomount Instalation_Tools_and_Overlays1.img

/dev/disk2

% hdiutil create IRIX_6.5.30-InstallationTools_and_Overlay1.dmg -srcdevice /dev/disk2

Preparing imaging engine…
Reading whole disk (unknown partition : 0)…
............................................................................................................................
(CRC32 $14E70CD2: whole disk (unknown partition : 0))
Adding resources…
.............................................................................................................................
Elapsed Time: 2.509s
File size: 381197818 bytes, Checksum: CRC32 $96FA2505
Sectors processed: 1018592, 1018592 compressed
Speed: 198.2Mbytes/sec
Savings: 26.9%
created: /Users/ehowton/Desktop/IRIX_6.5.30-InstallationTools_and_Overlay1.dmg

Right-click --> Burn Disk Image

Burning SGI *.img files onto CDROM using OS X

                    'c.          ehowton@Mac-mini.local 
                 ,xNMM.          ---------------------- 
               .OMMMMo           OS: macOS Catalina 10.15.5 19F101 x86_64 
               OMMM0,            Host: Macmini8,1 
     .;loddo:' loolloddol;.      Kernel: 19.5.0 
   cKMMMMMMMMMMNWMMMMMMMMMM0:    Uptime: 1 day, 21 hours, 51 mins 
 .KMMMMMMMMMMMMMMMMMMMMMMMWd.    Packages: 34 (brew) 
 XMMMMMMMMMMMMMMMMMMMMMMMX.      Shell: zsh 5.7.1 
;MMMMMMMMMMMMMMMMMMMMMMMM:       Resolution: 1920x1080
:MMMMMMMMMMMMMMMMMMMMMMMM:       DE: Aqua 
.MMMMMMMMMMMMMMMMMMMMMMMMX.      WM: Quartz Compositor 
 kMMMMMMMMMMMMMMMMMMMMMMMMWd.    WM Theme: Blue (Light) 
 .XMMMMMMMMMMMMMMMMMMMMMMMMMMk   Terminal: /dev/ttys000 
  .XMMMMMMMMMMMMMMMMMMMMMMMMK.   CPU: Intel i7-8700B (12) @ 3.20GHz 
    kMMMMMMMMMMMMMMMMMMMMMMd     GPU: Intel UHD Graphics 630 
     ;KMMMMMMMWXXWMMMMMMMk.      Memory: 19824MiB / 65536MiB 
       .cooc,.    .,coo:.

% hdiutil attach -nomount Instalation_Tools_and_Overlays1.img

/dev/disk2

% hdiutil create IRIX_6.5.30-InstallationTools_and_Overlay1.dmg -srcdevice /dev/disk2

Preparing imaging engine…
Reading whole disk (unknown partition : 0)…
............................................................................................................................
(CRC32 $14E70CD2: whole disk (unknown partition : 0))
Adding resources…
.............................................................................................................................
Elapsed Time: 2.509s
File size: 381197818 bytes, Checksum: CRC32 $96FA2505
Sectors processed: 1018592, 1018592 compressed
Speed: 198.2Mbytes/sec
Savings: 26.9%
created: /Users/ehowton/Desktop/IRIX_6.5.30-InstallationTools_and_Overlay1.dmg

Right-click --> Burn Disk Image