Could be an incompatible BIOS. Had the same problem with an older laptop that couldn't read the storage after the reboot to first run Win 10. The Win 10 Upgrade Adviser does not check BIOS for compatibility.
Could be an incompatible BIOS. Had the same problem with an older laptop that couldn't read the storage after the reboot to first run Win 10. The Win 10 Upgrade Adviser does not check BIOS for compatibility.