They're likely a cheap SD card inside the case with firmware that pretends to be 10TB. When you use them, they appear the correct size, but once you go over the size of the actual SD card (e.g. 256GB) you overwrite existing files and corrupt them.
You can tell that they're fake as the price is unrealistic.
I just searched for the prices of 256GB SD cards and they're about 20$. At this point I guess they put 128 or even 64 gb SD cards, otherwise it makes no sense...
Yeah, they go for the cheap ones so likely not 256GB. The only advantage of the bigger sizes is that it takes longer for the user to corrupt their files which is probably a disadvantage for those users.
Another way to determine if you've got a fake drive is that the I/O speeds will be much slower than a usual SSD.
The scam is that nobody makes 10TB SSDs. Scammers buy a 128 GB SD card, put it in a box, have it report itself as (very slow) 10 TB drive. Joe consumer doesn't fill 128 GB right away, so the drive looks fine at first. Then suddenly fails to write.
They aren't 10 TB products. The storage device (usually an SD card inside a larger case) has been modified to report 10 TB of space but actually has far less than that. Once the actual space has been filled, the device will write over the initial bytes (or some other undesired behavior).
It's not possible to buy 10TB of storage for the prices listed as a hard drive, not to mention as SSD.
If you understand the market value of non-scam SSD storage, the price of basically every item on that page is well into "too good to be true" territory.
Further, a lot of them have the trappings of a scam: e.g., can't spell worth shit, the same product is somehow sold by 15 different companies all with very fake sounding names, etc.
Go to a reputable manufacturer, like Seagate, and find a product. E.g., a 1 TB SSD will set you back $130. Now, the listings here are half the price for 10x? Too good to be true.
You can tell that they're fake as the price is unrealistic.