Comment by jorvi
1 day ago
Look at this Kioxia Excera drive[0]. It plummets from 6800Mb/s (850MB/s) all the way to 1600Mb/s (200MB/s).
Its not really a well ackshually comment, there's real pitfalls. Especially when doing 4K. RAW 4K is 12Gb/s and would fill 450GB within 5 minutes. ProRes 4444XQ within 10 minutes. ProRes4444 in 40 minutes.
Martinald his comment is right too. By being very inefficient and treating TLC (or even QLC) as single level and only writing one bit to a cell, much higher performance can be extracted. But once you hit the 80% full threshold, the drive starts to repack the last/least used data into multiple bits per cell.
A RAM cache and SLC cache can both speed access times up, act as a write buffer and mask the shuffling of bits, but there is a limit.
Lastly, its kind of ironic to see me portrayed as jaded when someone else is the one pouring out vitriol all over the thread. Ah well.
[0]https://tweakers.net/reviews/12310/wd-sn5000-4tb-ssd-hoe-sne...
> this Kioxia Excera drive[0]. It plummets from 6800Mb/s (850MB/s) all the way to 1600Mb/s (200MB/s).
This is interesting. Thanks!
> Its not really a well ackshually comment, there's real pitfalls
I don’t doubt the existence of pitfalls. But the lack of specificity was quite irritating!