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USB flash drives die suddenly without warning.If it is no longer accessible by Linux or Windows, it may have died.
umount calls sync. Just make sure to umount. Umount will return when all data is written.
on the dangers of usb, here is a suggestionpretend you copy a large file to stick, on my system, there is a pause, then I look for the flashing light on the usb stick,when flashing stops I know file is written, then it should be safe to umount.
Quote from: gerald_clark on September 10, 2012, 10:08:12 PMumount calls sync. Just make sure to umount. Umount will return when all data is written.HOWEVER, you still need to wait for the flash drive to show as ready after umount completes. One of the lies of flash media. The media system will report to the OS that it's done when it's not.