The current version of SpinRite, v6.0, was finished in 2004 before the era of GPT partitions, so it is completely unaware of that style of hard drive formatting. Consequently, SpinRite v6.0 can handle MBR-formatted drives up to 2.2 terabytes, but not GPT-formatted drives of ANY size.
SpinRite v6.0 full version
Though this doesn't help you now, support for GPT-format partitions is one of the major features of the next release (v6.1) of SpinRite -- which all existing v6.0 owners will be able to upgrade to at no cost.
Click Create ISO or IMG File and then Save a Boot Image File. When the folder structure appears select Users > your username > Desktop to save the SpinRite.iso file to the desktop on your Mac. Once that has been successfully created exit SpinRite and PlayOnMac.
Have you tried opening a second Terminal window and running the unmountdisk command again in that? Hopefully the problem is just what you think it is; that the disk has mounted again. If you try that before you boot the VM perhaps Spinrite will be able to see the partition.
Does spinrite need to be installed on the disk you are going to scan? Could I install it on a small USB flash drive and then run spinrite from that (after booting from an internal or cloned external HDD) and having done so, can I scan any of the connected drives?
On a non-fusion target I believe this should work fine with spinrite. But I failed here trying to create the RawDisk.vmdk, the command producing the error message VERR_RESOURCE_BUSY apparently because of the combined fusion drive arrangement. I tried the command on disk3 first and then disk5 (with some trepidation) but always got VERR_RESOURCE_BUSY.
Update: It is no longer necessary to use SpinRite for maintenance purposes on Windows machines: DiskFresh can do the maintenance part while Windows is running. See the separate DiskFresh review page. This is particularly useful since SpinRite took 330 hours (nearly 2 weeks) to do a full Level 4 scan of a healthy 2TB drive. During that time the entire machine was offline. In contrast, DiskFresh refreshed the same drive while it was in use in 22 hours.
Kickstart News review, published ugust 2004, updated January 2007: The opportunity for the first test appeared only one day after we received our copy of version 6. An 80GB hard drive on one of our busy storage servers decided to pack it in. Prior to trying SpinRite we were still able to access the drive intermittently but it was impossible to copy data or run a file undelete utility. A handful of important files had been written to the drive subsequent to the last backup the previous night; files which we needed within about 48 hours, which meant that a professional data recovery service (with its three week backlog) was out of the question. We removed the drive and installed it in an identical hardware configuration, then booted SpinRite 6 from CD and did a Level 2 recovery (see above for recovery level definitions). After 22 hours, SpinRite completed its work and pronounced the drive fully recovered. We reinstalled the drive in the original server. It ran perfectly, the research assistant who had created the required files copied them off the drive and that was that. Nice job SpinRite 6. The drive was still running fine as we went to publication with this review two weeks after the incident. We used a level 2 setting in SpinRite: Recover Unreadable Data.
SpinRite v6.0 achieves complete operating system independence by incorporating the FreeDOS operating system. This allows it to be used on any and all Intel/AMD PC systems. As you can see from the Windows screen image above, SpinRite 6.0 can create a bootable diskette or generate a standard, CD-R burnable ISO file to create a SpinRite boot CD. A bootable SpinRite can also be installed into any other motherboard bootable devices, such as USB flashdrives for easy, portable booting and use. 2ff7e9595c
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