The drive has 400 MB/s on the interface. That means that it's possible to deliver 34 TB per day to the disk and the rated 300 TB are achieved in less than 9 days. But the scariest effect is the "write multiplication:" the possibility to deliver the small chunks of the data through the 400 MB/s interface which can result in much more data actually overwritten on the flash (as the atomic size of the writes on the flash is quite big).

Of course an average consumer can't produce that. A lot of the data I write to any medium at home is never overwritten. But not every use is the use of an average consumer, knowing the actual limits is important.