Hello! New Mac user here and honestly, I don't have the greatest knowledge when it comes to computers in general. I have had a pc in the past and have quite a bit on my external HD's (Both are Western Digital). I am a photographer and the main thing I have on my external HD's that I need to access is my photographs and also HD family videos. My videos are M2TS files that I have already installed a VLC player to view them. I now want to be able to write to these HD's and also read from them as I keep my photographs/videos on the external HD's and not on the Mac HD. I understand that I need to format my external HD's to Mac OS extended or Mac OS extended journaled. Which would be best for my use? I'm afraid that I won't be able to view my videos any more if I choose the wrong format. Also, with everything on there now is from a PC (which I now can read from my Mac) Once I change the format will I still be able to read everything? I have already backed up one the external HD's to my Mac HD so that I'm ready to erase and format. This is for video (M2TS) and Raw/jpg files. Is there anything else I need to know? I'm just concerned I will not be able to access my current files once I format. Thanks for your time.