But that isn't a feature of Alcohol? I think I saw it in the software settings.
It's a feature of alcohol but only if your reader supports it.
OK, where can I see if my burner is good to do good back-up copies? Moreover, how can I know if it writes in RAW mode or not? And if it's EFM?
As almost no games are now sold on cds rather than on dvds, AFAIK, no-one now keeps an up to date lists of burners that can write cds in raw mode and accurately write weak sector patterns. E.g. the lists on the alcohol website were last updated in 2005.
Long ago, I wrote a guide to backing up safedisc 2 protected cds. The part that relates to alcohol is still valid though it's been so long that I'd forgotten that the plain safedisc 2/3/4 datatype settings are the ones to use for a burner that can accurately write weak sector patterns (i.e. bypass efm error unchecked) and that the safedisc 2/3/4 (EFM writer) is for those that can't (i.e. bypass efm error checked). In other words, I got it backwards in my previous posts in this thread. You can find my old guide here.
To find out if your burner can write in a raw mode in alcohol open alcohol and in the menu bar go to View=> DVD/CD Manager => Drive Features and then see what is shown as Writing Method: if any of the following appear- RAW SAO, RAW SAO + SUB, RAW DAO (96) [or DAO 16, DAO 96, DAO-PQ or DAO-PW] the burner can write in a raw mode.
Assuming your burner has a raw burning mode, whether it can write weak sector patterns with sufficient accuracy to produce a working back-up is probably best determined by simply trying it with alcohol and burning to a cdrw in the first instance. If the back-up works with either of the 2 safedisc 2/3/4 settings, well and good and then you can burn the image to a cdr for permanent back-up. Note though that if you are going to play from the back-up copy from any type of burner (rather than a plain cd/dvd rom drive), you will need to have alcohol's Ignore Media Type enabled in its emulation settings.
If, however, you really must know what capability your writer has to accurately write weak sector patterns, [other than by simply trying the 2 safedisc 2/3/4 datatype settings in alcohol and assessing the result], you can try the Sheep Test Guide but if it were me, I wouldn't bother.