[Bellyache5]

If this web server was running on AWS EC2 with attached EBS volumes then zeroing out a new partition was actually AWS' recommended practice to initialize the disk for performance reasons. EBS no longer requires this.

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-init...

[bluedino]

These were just plain-jane docker images, but it's interesting that this could be the source of it.