Surely as a USB device, it should be recognised by MAC or PC ?
Now it may well be formatted to FAT format, (PC) and so not work so well with a Mac,as files can get corrupted and may not save correctly, but I would have thought you could format to Mac OSX+ format using Disc Utility.
It is only a form of USB memeory stick is it not?
Now I don't know from personal experience, as I don't have a Utag; does it have special software included to extract details from you computer, or do you just add the info you want, manually ?
Maybe the manufacturers have a website where you can download Mac compatible software for the unit.