• 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.
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  • 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.

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New member
Dec 31, 2020
Just in case someone is interested:

Driv Size  Drive Identity     Location:    0      25%     50%     75%     100
---- ----- ---------------------------- ------- ------- ------- ------- -------
 81  512GB Samsung SSD 850 PRO 512GB     546.1   546.3   540.2   546.5   546.3
 82  2.0TB Hitachi HUA723020ALA641       147.5   137.0   119.8    98.6    73.0
 83  2.0TB Hitachi HUA723020ALA641       144.7   136.0   118.9    98.4    70.8
 84  2.0TB Hitachi HUA723020ALA641       153.3   142.3   126.1   103.2    75.3
 85  2.0TB Hitachi HUA723020ALA641       154.7   145.9   129.8   107.1    77.8
 86  2.0TB Hitachi HUA723020ALA641       140.8   131.7   117.5    98.9    71.1

It was a bit fiddly getting the system to recognize the USB stick for boot.
Otherwise, READSPEED ran with no problems. The HGST drives were read in a matter of seconds.
Spinrite 6.0 took over 50 hours to read and verify the same disks (level 4) on a different MB.
I never could get Spinrite properly to run on this system. DOS and Spinrite would load from a CD, but would never discover any of the drives.
I Can't wait for 6.1

MB has 32GB of ECC memory
Hi, thanks for posting your results! Interesting to have the CPU and mainboard info too! :)

Also interesting to see several identical drives' results together!

Those figures of 546 MB/s are the fastest I think I've seen!

I'm assuming that a lot of modern SSDs are maxxing out the SATA III bus, so that the top speeds that we're seeing are the limits of the SATA link. My Gigabyte GA-H87-D3H motherboard (with i7 4770S) caps out at 543.0 MB/s with my Samsung 860 Pro 512GB SSD, at least that's what I assume is happening.

Your system seems to have a slight edge! :)
I never could get Spinrite properly to run on this system. DOS and Spinrite would load from a CD, but would never discover any of the drives.
I Can't wait for 6.1
It sounds like your system is AHCI. In which case, SpinRite 6.0 would not see any drives. ReadSpeed has no problem with AHCI, nor will SpinRite 6.1.