Disk-image files- file size

I have created a disk-image file on my backup hard drive to save important data. This has 2 folders of around 180mB. I am now trying to save more files and the message comes up that there is not enough free space to copy the file. Do these disk-images have a certain size and how can I determine this. Is there an option to create bigger image file sizes. I would ideally like to create disk-image files up to 4 gB and then burn to DVD for backup.

Welcome to the Forums!
Yes, disk images have the size specified when they are created. You can't increase it, you need to create a new, larger disk image and copy the files to that.
You can see the size by selecting the disk image then File menu > Get Info, or by mounting the disk image, opening it and looking at the bottom of the window.
Use Applications > Utilities > Disk Utility to create a new disk image. There's a default choice for 4.7 GB (the capacity of a DVD).
Hope this helps...

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