Do not ever use a random USB flash drive. There are plenty of software exploits that can ruin your computer or life. And with this flash drive,
it can physically destroy your computer by blasting a load of voltage
to the USB controller with negative voltage. Think Wile E. Coyote and an
ACME Human Cannon. BOOM!
The basic idea of the USB drive is quite simple. When we connect it up
to the USB port, an inverting DC/DC converter runs and charges
capacitors to -110V. When the voltage is reached, the DC/DC is switched
off. At the same time, the filed transistor opens. It is used to apply
the -110V to signal lines of the USB interface. When the voltage on
capacitors increases to -7V, the transistor closes and the DC/DC starts.
The loop runs till everything possible is broken down. Those familiar
with the electronics have already guessed why we use negative voltage
here. I‘ll explain to others that negative voltage is easier to
commutate, as we need the N-channel field resistor, which, unlike the
P-channel one, can have larger current for the same dimensions.
Put simply, the bits inside the USB drive draws and stores a ton of
power. When a certain level is hit, it returns the power to the source,
which is either a dedicated USB controller or the CPU itself. This is
bad news bears. The amount of power returned overloads the circuits,
rendering it useless. Since a lot of USB controllers are built directly
into the main processor… bye bye computer.
Scary. Thankfully the creator hasn’t released the schematic for the drive.
There are enough USB exploits
floating around to warrant caution. Some will unknowingly install
malware or backdoor software, and now, there is at least one, that will
actually destroy your computer.
0 comments:
Post a Comment