Why is the read speed slower than the write speed of an SSD?

Question

Solid State Drives

Good afternoon! Help me figure out why my SSD read speed is slower than write speed?
Drive model: 240 GB Sandisk SSD Plus [SDSSDA-240G-G26]
How I installed the drive on a laptop. By chronology.
1. Cloned Windows 7 on SSD via USB. Then I replaced the HDD with an SSD.
2. switched the mode to AHCI in the BIOS.
3. Updated the SSD firmware.
It was then that I read on the Internet that you must first update the firmware, then switch the AHCI mode. And then just transfer Windows. Is it possible that such oddities in reading are due to my inconsistent actions?
Note. There are no complaints about the work of the disk. We can say that everything flies.
I've attached a speed comparison table.

Answer 1

Why is the read speed slower than the write speed of an SSD?

Because the cache works.
Well, in any case, this is not a test? and fortune-telling on coffee grounds in your case.
The program shows the weather in Africa, not the characteristics of the hard drive.
Just look at the top line where it says "C: 51% (113/224GiB)" ....

Answer 2

Because the logical sectors of an SSD are virtual and can be located anywhere at all. When a block is written, the data is written to the free place where it can be written the fastest, but reading must necessarily occur from the place where this data is located. And here you can’t do without switching chips / pages / blocks.
+ additional write acceleration due to the cache, as Artem pointed out - the data is first written to the drive's RAM and in the background, if possible, "crammed" into the nearest free blocks. This will not work with reading, the data must be read right now - as a maximum, the ATA command of the next read will be used without waiting.