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 SE-S084D is an attractive portable USB DVD-burner that works well with notebooks and netbooks alike. The new design makes this burner look as fresh as other USB optical drives on the market, and it does its job as intended.