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The disc you used is not the very best quality medium available.
The only way to recover data from that disc is trying to read it on a different drive. In fact, different drives have different capabilities to read damaged discs.
Among the best readers are Pioneer drives, followed by LG, and finally by Liteon drives (at least in my personal experience; different people can have different results, because as I said, different drives have different capabilities).
Using many different drives, you can recover most of data from that disc. If you don’t have many drives, you can ask to some friends to use their computers temporarily to read the disc