In December 2019 I heard from Jerzol from Poland who had added a SATA drive to his t620.
With the later production versions of the t620 the mSATA socket is missing from the motherboard leaving the M.2 socket as the only way of providing mass storage. However the pads for the mSATA socket are still there on the motherboard and Jerzol's approach is to wire a SATA lead directly to them.
The photo shows the mSATA socket solder pads on the t620 motherboard. As always with SATA connectors, if left off the board, the series capacitors in the data lines are also omitted.
Highlighted are the places where the four 10nF surface-mount capacitors have to be added and also the pads where the SATA data cable is to be soldered.
|mSATA pads||SATA cable|
The pads on the motherboard on the left and the make-up of the SATA cable on the right.
Here are the capacitors and the cable soldered in place.
Note the cable tie securing the cable to the board thus reducing any strain on the soldered connections.
Jerzol suggests picking up the +5V supply for the SATA disk (or SSD) from a fan connector or an internal USB port. Here you can see his particular choice.
Here's the completed project.
The BIOS reporting that it can see the standard flash drive (16GB) and the added 1TB SATA drive.
Any comments? email me. Added December 2019