First time 6.1 user on a Mac

  • SpinRite v6.1 Release #3
    The 3rd release of SpinRite v6.1 is published and may be obtained by all SpinRite v6.0 owners at the SpinRite v6.1 Pre-Release page. (SpinRite will shortly be officially updated to v6.1 so this page will be renamed.) The primary new feature, and the reason for this release, was the discovery of memory problems in some systems that were affecting SpinRite's operation. So SpinRite now incorporates a built-in test of the system's memory. For the full story, please see this page in the "Pre-Release Announcements & Feedback" forum.
  • Be sure to checkout “Tips & Tricks”
    Dear Guest Visitor → Once you register and log-in please checkout the “Tips & Tricks” page for some very handy tips!

  • BootAble – FreeDOS boot testing freeware

    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.

    GRC's “BootAble” freeware allows anyone to easily create BIOS-bootable media in order to workout and confirm the details of getting a machine to boot FreeDOS through a BIOS. Once the means of doing that has been determined, the media created by SpinRite can be booted and run in the same way.

    The participants here, who have taken the time to share their knowledge and experience, their successes and some frustrations with booting their computers into FreeDOS, have created a valuable knowledgebase which will benefit everyone who follows.

    You may click on the image to the right to obtain your own copy of BootAble. Then use the knowledge and experience documented here to boot your computer(s) into FreeDOS. And please do not hesitate to ask questions – nowhere else can better answers be found.

    (You may permanently close this reminder with the 'X' in the upper right.)


New member
Feb 16, 2024
After having listened to Security Now since probably the beginning, I bought Spinrite 6.1r2 to try on my Macs. (Thank You Steve!!)
I know Steve doesn't have a Mac's, but there may be someone else interested.
I used a Windows laptop to download the file and write to a USB stick.

On an iMac Late 2012 (IvyBridge i5-3330S) it booted and run with no problems.
On an iMac 2017 (KabyLake i7-7700K) it never showed in the Boot Manager.

Two differences on the 2017, are that it has what Apple called a Fusion Drive, which is an 2 TB HDD and a 128 GB SSD joined in a pseudo-RAID.
The HDD is connected to the SATA bus and the SSD is connected to the NVMe PCIe bus
The other difference is that the volume already Boot Camp installed and a Windows partition created.
Thanks for your report. The older iMac's success is expected... but you're going to need to wait for SRv7 for that newer machine. It will support UEFI booting and an NVMe driver, neither of which SRv6.1 has.
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