Problems with certain dc backups

Hi,
Im trying to copy DC backups and while most of them are perfect first time, others are causing me problems. I am unable to make disc images from any which have a single audio track on them. I get the following errors according to the software I use:
Easy CD tells me I need 4096 MB temp space
Clone CD creates an image 256 bytes in size
Discjuggler gives me errors.
Can anyone help or point me in the right direction. Sorry if this has been asked before, I have searched everywhere for an answer.
Thank you
Chris