Then it's incompatible in some way. Ask the maker what to try next.
Hi - first up, my tech knowledge is barely minimal, so please bear this in mind if you respond. My son has an X Box 1 (500gb). For Easter I bought him an external hard drive (Bipra 500gb). Info suggested that I simply plug in and will be presented with an option to format the drive and use as storage. This did not happen. I plugged into my laptop and all was ok. Found a post on the web that said I could reformat the drive from one format (cannot remember) to FAT32. This I did. I plugged into the X Box and everything worked perfectly. Problem is, the Xbox seems to lose sight of the hard drive once it has been turned off/turned on again. Havent plugged back into the laptop, but assume that I will have to go through the reformatting process again to FAT32 (I have no idea what this means, but it did work). How can I format the hard drive so that the X box always recognises it? Hope that all makes sense.