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.
The Samsung BD-JM57C is a Blu-ray player . This model--which comes with built-in Wi-Fi for wireless connection to your home network--has access to online content, including streaming movies and TV shows from Hulu, Amazon, YouTube, VUDU, CinemaNow, HotList, YuppTV, Netflix, Pandora, Rhapsody, AccuWeather, OperaTv.