"Ordered 2 flash drives both are probably counterfeit the first 1-2gb of write are at spec and then the speed drops to 1/3 of spec."
If you're writing to them constantly, that doesn't prove they are counterfeit. They will thermally throttle. Naturally, specs don't talk so much about that part. I have an older one that throttles down to almost nothing, but it is still technically writing correctly. I don't use it much anymore, because it's like 16GB which is nothing now, but I used to "liquid cool" it... by holding it with my fingers while writing. I suppose you could call it blood cooling for some metal cred. It wouldn't recover full speed, my blood cooling rig didn't have enough heat transfer (it's got some pretty serious rate limits on how much heat it can handle), but it would noticeably speed back up.
Now, if you can't write the entire space and read it all back with the data being retained, you've got counterfeit.
This has nothing to do with heat. Almost all SSD's have an SLC mode where part of the drive is operated in fast SLC mode. After the SLC cache is filled it will write to the slower TLC/QLC area. Any SSD benchmark will show this. SMR hard drives also do this.
If you're writing to them constantly, that doesn't prove they are counterfeit. They will thermally throttle. Naturally, specs don't talk so much about that part. I have an older one that throttles down to almost nothing, but it is still technically writing correctly. I don't use it much anymore, because it's like 16GB which is nothing now, but I used to "liquid cool" it... by holding it with my fingers while writing. I suppose you could call it blood cooling for some metal cred. It wouldn't recover full speed, my blood cooling rig didn't have enough heat transfer (it's got some pretty serious rate limits on how much heat it can handle), but it would noticeably speed back up.
Now, if you can't write the entire space and read it all back with the data being retained, you've got counterfeit.