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.
1 Hard Disk Space: 100-500 MB for Blu-ray player installation. 2  Disc Player: BD-ROM/BD-RE or Super Multi Blu combo disc drive.  Display Device (optional): To play Blu-ray movie on TV, HDCP compliant TV and video cards are required.