Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
If i buy a DVD writer that can support both the "-" and the "+" formats, which format disks should i buy? I mean is there any difference in the quality of the recording or in where i can use the disk afterwards?
Depends where you're using the discs. If you're using a standalone, check dvdrhelp.com, where there is a comprehensive list of compatibility with various players. In general though, go for whatever is cheaper in your area.