Explore iso image file
 

I have used to knoppix to grab an image off a pc to my external hard drive.I then used the command dd if=/sdc1/backup.iso of sda2 bs=4096 conv=notrunc,noerror to another pc I was cloning.This process failed and the hard drive was not seen after that even using fstab.Did I do this wrong?Is there any way I can verify if the iso image i grabbed is good.What command can i use to explore this iso image?

You can use the loop option of the mount command to mount a file that has a file system.
You may have to add the -t file-system-type parameter as in

See man dd. the of spec needs an "=" sign after it just like the if= has. Don't know if that is the problem since you don't provide any error message. When asking for help, PLEASE always provide as much information as possible (what you were doing, what error messages were displayed, recent updates, any other info that can help us with your problem).

Tom

Where is the '=' after of ?

You can mount that iso image by mount command.