We are also having exactly same problem in Casper 9.72, from a 10.10.4
image with new iMac's At present we have had to use workaround due to
the time frame of getting them out, format the drive....it fails, try
again it formats succesfully and then t...
Sophos here as well. It just works effortlessly in the background and is
seemless for integration with the management console, our Windows/Mac
are all running it and it's rare it to cause any problems with user base
of 400 desktops, oldest being 2010...