SDR scratchspace

It's OK, I have solved it. For anyone else with the same issue, steps are below. You can substitute the 512 with 256 if you don't have much RAM in your server/PC.

1. Create your SDR iso in the usual way.

2. Open the iso image file and copy the contents to a folder on your hard drive such as C:\source

3. Create another folder such as C:\Mount

4. Open an administrator command prompt and type;

dism /mount-wim /wimfile:c:\source\sources\boot.wim /index:1 /mountdir:c:\mount

5. Once the image mounts type;

dism /image:c:\mount /set-scratchspace:512

6. Check that the scratchspace has taken successfully with;

dism /image:c:\mount /get-scratchspace

7. Un-mount the image and commit the new settings with;

dism /unmount-wim /mountdir:C:\mount /commit

8. Create an iso image of the new files that now exist in C:\source and make it bootable by importing the boot files from the original SDR iso you created in step 1. I used WinISO but any iso creation software should do the trick.

Hope this helps someone else.