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.
This Seagate Expansion STBV3000100 external USB 3.0 hard drive lets you rapidly store up to 3TB of important data from your desktop. The plug-and-play design makes setup easy, eliminating the need for driver installation or configuration.