In order to test the 831SX's DL writing quality, we used the LiteOn SOHD-167T and the Plextor PX-716A drives, to scan the burned media.

Traxdata DVD+R DL 2.4X @ 2.4X

Even though the CDSpeed utility reported a good burn with Traxdata DL media, the Plextools quality check utility reported bad quality media, and we can see the PI values exceeding the acceptable limits by far, with the media failing near the end of the scan.

Philips DVD+R DL 2.4X @ 2.4X

In the case of Philips media, things are even worse. Both Quality Check utilities reported bad results for the media. Poor quality once more.

- Summary

Obviously, the 831S is not the ideal burner to cover your DL burning needs. Even though this drive is meant as a quick backup solution and not as a primary backup device, we would like to see better burning quality for DL media.