Some time ago I had a problem with an ExtFS partition that was not unmounting properly, which I resolved then by repairing the partition.
https://www.wilderssecurity.com/threads/extfs-not-unmounting-under-10-10-5.379912/
I mentioned then how I had some problems with disk errors when using the ExtFS partition as a VMWare Fusion boot disk, suspecting a problem with Fusion. I've finally found a fix (or a workaround) for that disk error problem, and the problem isn't Fusion, it's OS...
Resolved: "Corrupt" ExtFS disk booting Fusion VM
https://www.wilderssecurity.com/threads/extfs-not-unmounting-under-10-10-5.379912/
I mentioned then how I had some problems with disk errors when using the ExtFS partition as a VMWare Fusion boot disk, suspecting a problem with Fusion. I've finally found a fix (or a workaround) for that disk error problem, and the problem isn't Fusion, it's OS...
Resolved: "Corrupt" ExtFS disk booting Fusion VM