Using Windows Explorer, I moved several gigabytes of data from my hard drive to a USB drive. Then later in the day, Windows Explorer crashed - it said something like "Windows Explorer has encountered a problem and needs to close" and it also mentioned the possibility of losing data. I know that sometimes when you copy stuff to a USB drive, not all the data will get copied immediately, due to caching, and that's why you need to click the "Safely Remove Hardware" icon before you unplug the drive. I never clicked on that after I moved my files, because I just left the USB drive plugged in. Is it possible that data on my USB drive may have been corrupted by Windows Explorer crashing? I would imagine that the caching mechanism is a lower level function that wouldn't be impacted by an application crashing, but then maybe Windows Explorer is deeply tied into the OS, so I don't know.