Why can read speed be slower than write speed (kingston SSD)?

Question

Solid State Drives

A friend bought a new Kingston SSD (512 GB), m2
Benchmark shows a sequential read speed of about 1.2 GB / s, a write speed of about 1.8 GB / s.
The benchmark is run on a laptop, the SSD is almost clean (it costs only the OS and the benchmark)
Is this a normal situation, or is it some kind of incomprehensible "optimization"?

Answer 1

The benchmark is run on a laptop, the SSD is almost clean (it costs only the OS and the benchmark)

Usually there is one disk in a laptop, there is a very high probability that your friend's OS is on this very SSD that he is testing.
A lot also depends on the benchmark, its settings, the OS from which it is launched, and some other factors.
Speed ​​testing is a rather complicated process.
In general, this situation is quite typical for SLC caching on disk. Read and write speeds are generally about the same in a normal disk state. But since the write is in SLC mode with an empty cache, it will be faster than TLC.