Every once in a while forensic examiners come across hard drives that get shorted. In most cases, a drive has become shorted after experiencing overvoltage either due to a power supply failure or as a result of a user error. Here is what happens to drive in these scenarios and how to fix this.

Most drives have two TVS diodes: one on the 5V rail and another one on the 12V rail.

In a situation when a drive experiences overvoltage, these diodes protect the drive’s circuit by converting the surplus electric power into heat energy and warming up. In case of reverse polarity, the current will go in the opposite direction and will completely be flowing through the diode, thus warming it up, too. If overvoltage or reverse polarity episode is relatively short and the dissipated energy is not too high, the diodes will recover and continue working. Otherwise, the diodes “sacrifice” themselves and get shorted.

When the drive is subsequently powered, the diodes create short circuit. This term describes the situation in which there is a low resistance connection between two nodes. That is exactly what happens to a drive when its TVS diodes are shorted.

Hard drive with TVS diodes

If you try to connect such drive to Atola Insight Forensic, the Source window will have a short circuit alert to notify the operator about the detected issue.

Short circuit alert

A drive with a shorted TVS diode cannot be identified or imaged. You can try to run diagnostics on the drive, although it cannot be properly diagnosed and the report will suggest that the TVS diodes should be replaced.

Diagnostics report of a shorted drive

However, if you need to image such drive and you have no new TVS diodes at hand to replace the shorted ones, you can actually image such drive with an Atola imager just by removing the diodes!

It is safe to image such drives with any Atola product. Both Atola TaskForce and Atola Insight Forensic have short circuit and overvoltage protection to secure both the imager and the drives attached to it from circuit failures.

The best way to remove the diodes is by heating the area of the drive where the they are located with a hot fan (e.g. in a hot air soldering station), and then gently removing them with tweezers.

A hard drive with its detached TVS diodes

Once the diodes have been detached, you can plug the drive to Atola Insight Forensic and proceed with imaging data from its platters.

Imaging a drive with detached TVS diodes