On AliExpress and probably elsewhere there are small USB SSDs available, in neat aluminium enclosures claiming capacities up to 16TB. It sounded too good to be true, but I tried ordering one anyway.
The unit arrived and claimed a formatted 16TB. It was formatted with FAT32 and it was possible to write several GB of data to it. Slowly. But when trying to partition it or formatting it with NTFS or APFS it threw up errors. Which made me suspicious.
With a bit of force it was possible to open the case and remove the contents. It turned out to contain two populated microSD card sockets and a chip or two completed obscured by silicone. The two microSD cards each had a capacity of 62GB. So 2 x 62GB = 16TB? It was too good to be true. So buyer beware!