Whenever I copy a file onto a USB, it starts at 30MB/s then goes down to 20, then 10, then 8 and sometimes and even 2MB/s and stays there. What is happening to the drive that the write speeds decrease so much?
In: Technology
Writing dense flash memory is slow. Writing cheap dense flash is *very* slow. Some USB drives get through this by having a bit of faster memory between the big NAND and the PC so you can copy small amounts of data fast (and it filters onto the slow memory with time).
Except when you dump data onto the drive the fast memory fills up and then the speed drops/stops until the slow memory accepts the data. Depending on how the drive works you might see waves in the speed as the fast memory is emptied and the PC fills it up quickly.
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