Why aren't there 600MB/s SSDs on the SATA/USB port?
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Solved by Sakkura,
SATA3 uses 8b/10b encoding, so the theoretical usable bandwidth is only 600 MB/s. The fastest SATA SSDs can do 550 MB/s or a bit more, which is the practical limit. USB3.0 also has 8b/10b encoding overhead, making the theoretical usable bandwidth 500 MB/s. Since USB is a more versatile interface, it has some design aspects that can hamper performance for storage use, so you'll have an even harder time approaching that 500 MB/s limit in the real world.
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