@JasonW said:
all used and unused space must be read by the FOG client.
Depends on the image type. Resizeable images resize the partitions first, so that only used space is captured.
When deploying an image, unused space is recognized in the image file and is much smaller than the size of the full hard drive. The compressed image is written to the FOG server very quickly.
Again, it depends on the image type. But generally image deployment is a lot faster than image capture.
Here’s a great article on the subject: https://wiki.fogproject.org/wiki/index.php/Image_Compression_Tests