What is different between these two sentences? 昨天我记不住新词 昨天我没记住新词

昨天我记不住新词 i couldn't remember new phrase yesterday 昨天我没记住新词 i have not remember the new phrase yesterday. 记不住 - couldnt remember (trying to remember but forgot, not purposely forgot) 没记住 - do not remember (didn't memorise/ didnt remember at all)