It is said that SSD is equivalent to flash memory, that is, USB flash drive. But the transmission speed of the USB flash drive we usually use is only ten meters per second. But ordinary hard disk read

It is said that SSD is equivalent to flash memory, that is, USB flash drive. But the transmission speed of the USB flash drive we usually use is only ten meters per second. But ordinary hard disk reading Solid state drives and flash drives use the same storage particles, usually MLC memory chips (there are also a few other SLC or TLC chips). But the structure of solid-state hard disk and flash disk, that is, U disk, is different. Flash disk, that is, U disk, generally uses MLC to store particles, with 2 channels, 4 channels and 8 channels, but the most common one is single channel. The more channels, the faster the reading and writing speed will be. Some 4-channel and 8-channel flash drives also have caches, and the structure of flash drives with caches is very similar to that of solid-state drives. Solid state drives start with at least 4 channels, and there are also more than 8 channels. Generally, there is a cache of more than 64MB, and there are few solid-state drives without cache. Cache can improve the reading and writing performance of small files, which is very helpful to improve the transmission performance of 4K. So it is also a solid-state memory chip, but the speed gap is still very large. The USB flash drives in the picture range from single channel to 8 channels, which can be compared and referenced.