Error 1808 or Image File Decompression Errors during an image integrity check
These errors are caused but lack of space or fragmentation on the machine running the integrity check, issues with the source machine or network issues. They can also be caused by too much compression.
There are multiple causes so there are multiple solutions.
Clean up the machine running the integrity check.
To ensure you have enough space to do the integrity check, multiply the size of the image by 2 and ensure there is that amount of free space on the hard drive.
Run a defragmentation on the hard drive. A boot time defragmentation is best but one done from within Windows should be fine.
To ensure you are getting the best image possible:
If the machine is an IBM/Lenovo, make sure you disable preDesktop and use -IB or -ID to take the image.
If the machine is an HP, use the WinPE preOS to capture the image and not DOS.
Try taking the image with the switches -FNI -FFX -NOIDE - NOUSB.