you may try if you can retrieve something with IsoBuster.
Apart from this, the data should be on the HDD if the burning process just failed.
Yes I know it should be but I was an idiot. Basically it was a bunch of files on the hard drive, I accidently cancelled the burn process and then absent mindedly deleted the folder I was burning. It was really large and as such it didn’t go to the recycle bin but away for ever.
I’m not even at the computer anymore so I have no access to the data whatsoever.