The reason i ask is that i had pics on a CD-RW and wanted to add more. I shoved the disc in, used Nero express choosing add, then selected more pics as i normally do. Having now just checked the disc, i only have the new ones i have just burned. Have i lost the previous ones for good or can i get them back with any sort of software and what did i do wrong?
You can add / remove more data to a CDRW disc up to about 1000 times, it acts just like a hard drive.
A CD-R however is 'slightly' different, you could put say 590 Mb of data on a disc and leave 60 Mb free but each burn of data takes up a specific amount of space, 24 Mb comes to mind, so the next burn you will only be able to put about 30 Mb of data. Alternatively you could burn 590 Mb of data and then, in effect, seal the disc to prevent any more data being added, once done then that's it.
If your certain they were already there,and you didn't opt to reformat the disc before adding new ones,they should still be there.Put the disc in a CD-ROM and use Windows Explorer to have a look on it.If they have definitely gone,but your still certain they were on it,then there are data recovery tools available online that you can try to recover them off the disc.
I have two discs which I copied all the files from a hard drive on but cannot access them. Whenever I try to open a file I get the message "Can't read file header". I can see all the files on Explorer. Is the PC Inspectoor File recovery programme likely to help me with this?