The tokens have SD Card NAND flash memory function in a RuggeDrive form. Operation is over ‐40 to +85°C.

“The Industrial DFX is ideal if you’re looking for memory storage that gives you the flexibility and functionality of an SD card, with superior security and durability,” said Nexus.

They come in MLC (multi-level cell) or SLC (single-level cell) models.

“The biggest difference is the number of times each memory cell can be written to before it wears out and is no longer usable. MLC typically provides around 3,000 writes, where SLC provides 60,000 to 100,000 writes per cell,” said Nexus. “SLC is also faster and has better un-powered memory retention capabilities over time.”

Available is one SLC model (DFX1GB-­IS) with 1Gbyte of flash and DFX-­I which uses MLC to reach 4‐64Gbyte.

Receptacles (sockets) come in: board mount, panel mount and IP-rated panel mount. All are designed to stay connected under shock and vibration, and are rated for 50,000 insertions, compared with 1,500 for most type A USB receptacles, claimed Nexus.

Why the odd shape?

• The unique shape means the token can’t be plugged into un‐adapted PC or system.
• No one can push an SD Card into the adapted system.
• The over-moulded shell is “impervious to penetration by liquids and practically crush‐proof”, said Nexus.
• It provides the OEM with an additional revenue stream from the sale of memory tokens to users, said Nexus.

On existing market acceptance, Michael Barrett of Nexus told Electronics Weekly:

It is a proprietary interface, but one that has been around for decades and is trusted by the military in both UK and US. Many of our customers across different industries like the fact that it is a different physical interface particularly when they are using the RuggeDrive range – USB or SD protocol. It gives their industrial systems a level of physical protection that they don’t get if they use conventional USB sticks or SD cards.”