If the Amazon Fire TV is only seeing 197MB or other small amount of a larger connected USB drive, it’s likely because the USB drive has a hidden partition. You may think the USB drive has only one partition, but it likely has a second hidden partition if the Fire TV is only seeing it as a small drive with less than a gigabyte of space. The most common way to end up with a hidden partition, like an EFI system partition, is by using the drive to install an operating system like Windows. Since the Fire TV mounts the first partition it detects, it’s mounting the small hidden partition and ignoring the rest of the USB drive. To fix this, all you need to do is delete the hidden partition. To do so, simply follow this guide.