Hi , Recently I just reformatted my mac as some old settings may have gone . so here's the problem , I'm been unable to copy things to my external harddrive as it is only can be read only. So is there anyway to change it to read & write because before I reformat my mac , it's able to read & write . PS : please don't ask me to reformat the external had to exFAT or mac formats because i have to use this hd on windows too. Thanks !