OK guys this thread is finally over,this is what i did (it works):
1.Download Segagen,Lemecs loader and Echelon Kit utils
2.Get some Genesis aka MegaDrive roms.In order to work in segagen they must be *.bin,US versions and have names with less than 28 characters.There are tools to convert to bin and US.
3.cdrecord doesnt work here,so i used cdrwin.You have to binhack exactly as Thoblen said:
Ginreset.bin
Manifest.bin
Mde_us.bin
1st_read.bin
CDRWin gives me 11700,so used that value in binhack and mkisofs.
Ip.bin = read only for all binhacks BUT 1st_read.bin (again,THX Thoblen)
4.There is no 4,well,burn and enjoy
I cant believe it was so easy (damn,ive been pretty stoopid) and i cant believe no one told me before... Almost 200 ppl have seen this thread so far...
Now time to test all my roms so i can make the ultimate segagen pack and share it somewhere.
THX go to all of the forum guys who helped (specially Thobled,you gave me all the tips i needed),Echelon,Lemec and of course SEGA,authors of Genesis,Dreamcast and the original Sega Smash Pack (Echelon guys cracked it in order to make their launcher)
THE END (at last...)