What files exactly?

Have you tried the GOG downloader and more, instead of the backup download files. You can then download directly to disc.

always burn on the slowest setting and verify data integrity.

edit - you should be able to buy a fairly cheap bd-burner. even the discs are cheap. it looks like faulty hardware. maybe an upgrade is overdue anyway.

edit 2 - you're not burning bin as disc images are you?

I have bought a new dvd recorder LG 15€ no big deal :P

same problem.
you can see the attached screenshot.
only with GOG files. i have tried other files and is working fine

why is it verifying after a 2 minute burn. there's no way it could have burnt that fast. you should take more photos through out the process. i'm guessing your burning the bin as an image.

i am trying a small game that for fast testing. this game have only .exe, not .bin

i might try to change my sata cable... i havent tried that yet.

ok, could you try power2go from cyberlink -

https://www.cyberlink.com/downloads/trials/power2go-platinum/download_en_GB.html

i use power2go 7 which is an old premium version. this is free-ish but should give an error log which can be useful.

Your issue piqued my curiosity, so I tried burning a game myself (Torchlight 2). My DVD recorder is also from LG, speed was 8x (minimum supported), Kaspersky antivirus was active, the dics (DVD-R) were from Verbatim and the program I used was ImgBurn. The burning and verification were successful and I was able to both copy the installer from disc and install the game normally.

The way I see it, my suggestions would be following:

1) Redownload the installer or try with another game
2) Use another program like ImgBurn (user Braggadar also reported success with the program above)
3) Uninstall your antivirus (not just disable it)

hmmmm
none of the files i am writing verified correctly.........
some are playable and i didnt noticed that but some are not like gog files

i have tried

2 different DVD recorders
3 different burning software
2 different blank dvd's and DVD+R/DVD/R
uninstall the bitdefender antivirus

what else? lol

change sata cable? buy new pc? LOLOL

Sure, why not, try to change the SATA cable.
Here's an idea:
- Make an image of your OS disk https://www.online-tech-tips.com/computer-tips/backup-your-computer-by-making-an-image-of-your-hard-drive/
- Backup non OS data somewhere
- Install a fresh Windows, then burning software
- Try burning again
- If that fails, just restore your system from the image
- If it works, use the new Windows, reinstall your programs and put everything back from the backup

changed sata port of the dvd writer and worked!

thank you all guys for your responses and for your help

I am happy for you that you found out the problem. There are not many people left like us who still burn discs. Even if i use mainly Blu-ray Discs because the games became so big these days (dying light is 30gb big...)