  Digitalization continuously pervades all areas and the Internet of Things
(IoT) is still on the rise. This leads to an increased need for efficiency in
the development of embedded devices and systems composed thereof. Hybrid
testbeds are common environments to representatively assess, e.g.,
hardware-software interaction, interoperability, and scalability. Although
automation is inevitable to achieve efficiency, not all devices offer
interfaces to be fully software-controlled. Most notably, block devices tend to
be inaccessible for software outside a Device under Test (DuT), especially when
the latter is in a dysfunctional state.
  This paper introduces the Networked SD card (NetSD) which enables remote
access to removable block devices. The proposed system consists of a hardware
part, which enables multiplexed access to a block device (e.g., an SD card) and
a software part which enables remote access to the block device (e.g., via HTTP
or network block device). NetSD thus adds testing and automation possibilities
to DuTs without the need to modify their hard- or software. During the hardware
design, we fund that different SD transfer modes and access profiles (read or
write focus) benefit from different pull-up resistor configurations for the
data lines.

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