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Ask HN: SSD File Transfer Speeds

2 pointsby yonzabout 2 years ago
Why do file transfer speed run at 1&#x2F;5th to 1&#x2F;10th the quoted maximum read and write speeds?<p>Researching online, you can get an SSD that supports 7,000+ MB&#x2F;s read&#x2F;write speeds and top out at 3,000MB&#x2F;s for a USB4 enclosure. But I only find people getting 1GB&#x2F;s transfer speeds for regular setups (without enclosure).<p>Why are benchmarks and file transfer speeds so different? Are there any sites that track transfer speeds? Where would you start debugging this?

1 comment

wmfabout 2 years ago
SSDs generally need parallel accesses (&quot;queue depth&quot; greater than 1) to get high performance but most software generates serial I&#x2F;O.