I've recently bought some SSDs off of Aliexpress. Entirely bought them assuming I'd lose 10 bucks. However, I thought I'd test them.
Since I'm on Fedora, I had to find software to test this for me. f3probe seemed to be perfect for this.
The following is what I used to test:
See what the estimated disk size is, quickly:
sudo f3probe --destructive --time-ops /dev/sdX
Just make sure /dev/sdX is your actual disk. The following works best, for me:
lsblk
The following covers actually testing by writing to capacity and then verifying the data is OK.
First, make sure to mount:
sudo mount /dev/sdX /run/media/yourmountpoint
Then, write:
f3write /run/media/yourmountpoint
Then, verify the written data.
f3read /run/media/yourmountpoint
Overall, I got around the space advertised. Happy for that.