Although I started a post about this when I first ordered my 3510 I cannot reply to that post so I'm starting again.

I have managed to install a 2nd hard drive into my 3510.

The unit was ordered with the NVMe 512GB drive which, for reasons known only to the creature that designed the 3510, means that the space that a 2.5" SATA drive could go in, is blocked. Only by a few cubic millimetres though.

After purchasing cable 4G9GN,  a SATA to M.2 adapter and a £25 240GB Kingston SSD the installation required a small amount of double sided tape to hold things in place. I would like a 3D printed bracket but that's probably overkill.

 

 

 

The system recognised the drive immediately and appears quite happy.

I will try and report back on performance and any issues (if the forum allows).