The difference between SSD and HDD

The biggest difference between SSD and HDD is that it does not have the necessary mechanical parts of the HDD, the disc, the head rocker arm, which is determined by the different working principle of two kinds of hard drives. SSDs save time in mechanical parts movement compared to HDDs, and the primary storage element NAND flash used by SSDs is an electronic component, so its data travels much faster than HDD.
In addition, according to the test, the HDD data operating time of about 95% is spent on mechanical parts movement, the specific can see a few basic magnitude:

The data operation time of HDD is mainly composed of the following:
1, the external interface transfer time, that is, from the disk buffer to the interface transfer time, the magnitude is 110 microseconds.
2, the internal interface transfer time, that is, from the disk platters to the internal disk buffer transfer time, the magnitude is 440 microseconds.
3, the disc rotates the time addressed to the corresponding sector, that is, the disc rotates half the time (the average time is 4-5 milliseconds).
4, the time the mechanical head moves to the specified track, that is, the average address time of the pointer on the platter, about 8 milliseconds.

The difference between SSD and HDD