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Data errors on sata drives in [...]by
Data errors on sata drives in NEWER USB3 thumb drives, usb cradles and usb external drive units using "enhanced speed" "enhanced performance" USB 2(3?) featuring UASP (USB Attached SCSI Protocol) under libvirt/virt-manager as a raw storage device.
UASP does it's own caching, presumably confusing the qemu emulator connection.
make the following change
Under the VIRTUAL DISK tab:
Cache mode: directsync
IO mode: threads
other setting "hypervisor default"
this may? negatively effect ssd and flash devices, but seems to clear up miswrites.