You can specify the image size for the DVD.
In Capture Disk Image Task, Click on Advanced button. A new window will appear.
from the drop down menu, select Maximum file size
Other (specify).
specify the data in MB eg 3900 MB in case of DVD.
While capturing it will split the image at your specifed value.
If you have Siteservers in you environment then make use of Replication and copy the images to other servers.