For a small collection of USB flash drives using the computer and manually copying the files is okay, but with bulk flash drives of say 100 devices or more, a piece of equipment is better suited for the task. Although the equipment will cost money and is not free like the features on the computer, it makes up for the expense because of the time and money saved by the speed and efficiency of the equipment.
To find out more about the equipment there is an article posted by a very prominent website called EverythingUSB and is an authority on USB related products since 2000 when the first flash drive was introduced to the world. The article is about a USB duplicator which makes copying files to bulk flash drives very quick and very easy. A true-time saver for those who need to data load content to a large number of flash drives.