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If the disc burner is not always successful with completing discs, there are some things to try for the problem:
1. use a disc cleaning kit, to clean the disc lens etc. Here's an example:http://local.sears.com/Maxell-DVDLC-DVD-Lens-Cleaner/p-05737947000P?st=1424&sid=IDx20141117x00001xlpla#!/
In these cleaning kits, you usually have a fibrous disc, which you apply some cleaning solution from an included bottle to, then insert it into the drive and it rubs against the parts that need cleaning in the disc drive.
2. use less-cheap blank discs. This is not always a solution, but it can be what is indicated, if it produces better and more favorable results. It's not by any means a sure cure! but it is something to try.
The cheapest of blank recordable discs, is more prone to failure, either to write or to finalize or to prove fully readable after finalizing the disc.
3. change your CD (or DVD) burning software. Or, switch to the most basic means of burning discs that you have on your computer - likely to be the software provided with the computer and already installed on it. If that's the software you are using, then if you cannot switch to other software, at very least, set the 'speed' (e.g. 16X, 8X) to a lower number (for instance, if 8X, set it to 4X or 2X.) Sometimes a combination of this, that, and the other (various factors) makes it necessary to run the burning of a disc slower than the maximum reading speed of the drive itself.