The USB may loose a block or two before the entire SSD fails. In this scenario, the USB is over 10 times more reliable on each logic gate but would not benefit from the wear leveling systems of SSD. This means you can have a MLC SSD rating of 8k cycles and a SLC USB device with a rating 100k cycles. Both USB and SSD devices can use any of those types of NAND, although SLC is more commonly found on SSD devices, they also can be found with MLC NAND just as USB devices can be equipped with SLC. Any difference between cycle ratings is really just the difference between SLC, MLC, and TLC NAND. As for being rater for more or less delete/write operations on one over the other, they both use the same NAND logic gates. I suppose my point about treating it as an SSD is to say that the more you delete/write to it, the faster it will fail. Of course, the other side of the coin is that while a USB drive may loose a block and experience reduced capacity, SSDs with leveling systems tend to fail all at once. In a USB drive there is no mechanism for this and you can loose blocks faster. This makes sure the SSD does not try to delete/write to the one location more than any other. SSD has ‘leveling’ software to ensure that data is written to the drive in an even manner.
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