Problems with DVD-RAM

After many times trying evry program that allows DVD-RAM dormat, I succeed to format the DVD-RAm first in UDF v.2 ,UDF v2.6 and then FAT 32.
Evrythinh goes OK but when I put the DVD-RAM in the driver after formatting it, sometimes the driver recogniste it directly and other time doest ans the lighht keep blinking.
What is the problem?
any help, please,