How do USB Flash Drives store information?
In: Technology
Each bit is stored in a MOSFET transistor. A transistor have three terminals. A source and drain for the current and a gate which controls if the transistor will allow current through or block the current. So be charging or discharging the gate we can controll if a signal is allowed to pass through the transistor. But in flash memory we do not want to accidentally have the charge leak out of the gate as we can not constantly be charging up the gate when you unplug it. So we make sure the gate is isoletad from all electrical connections. This does however pose the problem of how you can charge and discharge it to set its value. The solution is literally quantum physics. By manipulating the charges in the transistor and in an additional gate on the transistor using very high voltage you are able to quantum tunnel electrons through the insulating material to charge or discharge the gate.
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