darkraid3r

OK first i am going start by saying i am new to the MD I bought a used Sony MD MZ-R70 problem i am having is i insert a new blank md and start to record it all goes well then when it is done it said TOC EDit i do not touch it till it is done then it said end ok then i turn off my md and press play but it keeps telling me blank disk. what am i doing wrong? please help