Reading a bit on system image, it seems that Windows 7 will only allow more than one system image on an external HD *if* the total is less than 30% of the space.

- Is there any logic behind this relatively tight limit?

- Is there any way to expand the limit? I went through some of the backup settings (as well as searching) but was unable to find anything.

I have a 320 Gb hard drive and my system image takes up less than 130 Gb. So I'd like to keep 2 on there if possible but it won't let me - deletes the old one.