Q - Anyone able to boot an older Mac via CD or DVD burned from SR .ISO file?

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    To obtain direct, low-level access to a system's mass storage drives, SpinRite runs under a GRC-customized version of FreeDOS which has been modified to add compatibility with all file systems. In order to run SpinRite it must first be possible to boot FreeDOS.

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Well-known member
Sep 18, 2020
Trying to finalize my "boot a Mac" instructions; already posted instructions for:
  • Booting FreeDOS natively from a USB Flash Drive for non-UEFI systems (roughly pre-2015)
  • Booting a UEFI system from an external drive with MacOS, or Linux, or Windows, running VirtualBox (roughly 2015 to 2021, Intel Macs)
Trying to boot my 2012 MacBook Pro from a CD burned with the SR 6.1 ISO, and also the SR 6.0 ISO, and it won't boot from either. Note that:
  • The same CDs will boot a PC
  • The Mac will boot from a FreeDOS 1.3 LiveCD (so a bootable CD is operable on this Mac)
  • The Mac will boot from a USB Flash Drive, but I'm trying to be comprehensive and provide information for those who can't boot from USB
  • There's something very finicky about my particular Mac booting from the SpinRite ISO/CDs, or
  • There's something about the way those ISOs were built that is not as universally compatible as one would hope
Any experiences from anyone else would be welcome, thanks!!
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