Various causes: There are very many causes, from congestive heart failure, to lymphedema, to venous insufficiency, blood clots, pregnancy, a various other causes, including serious and not-so-serious causes.
I have a Sony DVP ns55p blu-ray player with a usb port in the front. The player requires that the usb flash device (thumb drive) be formatted in FAT32in order to recognize it.
You can enjoy video, audio and image files on your Blu-ray Discâ¢ player or Network Media player from USB or DLNA devices. See the chart below for supported file formats: