32gb ramHDD &SSD&EMMC&NAND
disco duro solidoSSD OEM32gb ramHDD 32gb ram+8618750919058, the principle 32gb ram+8618750919058, in fact, is the same as the tape played as a child, such as this:
All of them use “magnetism” to record information, but the shape of the medium is different. The following figure is a mechanical hard disk, a silver disc on which information is recorded, and the head can scan the entire disk by rotating; So, tape/hard drives have one thing in common: they need to be rotated.
so the read and write speed and rotation speed are directly related, but how many pieces can a motor be fast?
in the access data, if the data is continuous, then the head will continuously cross the disk surface, so the speed is not bad, if the data position is random, the head will swing around, considering the problem of acceleration, it is easy to think that such access speed is super slow, which is continuous reading and writing and random reading and writing.
SSD and EMMC’s storage units are based on NAND, a flash architecture that combines the high density of EPROM and the flexibility of the EEPROM structure, which is less expensive and more capacity than the previous generation of flash memory.
more principles, which will not be elaborated here: see NAND (computer flash memory device)
The basis for storing data is electricity, the speed of electrons, of course, much faster than the motor, no longer need to run around the magnetic probe, only the address line can be directly reached, so this structure in the random access performance has obvious advantages over mechanical hard disk. The solid-state drive, using a large number of NAND particles to form an array, coupled with the main control chip, is to increase the speed of continuous access to also exceed the mechanical hard disk.
that is the inside of the SSD:
EMMC is simpler than the SSD structure, not so complex advanced master, NAND particles are also less, so the speed is slower than the SSD, Continuous writes are about the same as mechanical hard disks, continuous reads are slightly slower than mechanical hard disks, but random access is still completely more than mechanical hard disks.
this is what an EMMC chip package looks like:
At present, the storage of portable devices such as mobile phones/tablets/MP4 is almost all EMMC.
the storage of USB flash drives is also based on NAND, and the structure is similar to EMMC. However, because of the USB2.0 interface limitations, the speed is limited, if it is a USB 3.0 USB stick, then the speed and emmc directly soldered on the motherboard are basically at the same level.
In addition, there is a big gap between the speed of USB sticks or EMMC at different price points. The price of some top U disks is similar to that of some SSDs, because its main control scheme and chip level are very close to SSDs, and the speed has caught up with low-end SSDs!
then, in the computer running experience: SSD> EMMC>HDD
In the end, which SSD is stronger?
personally recommend the following brand products: Intel, SanDisk, Pucott, Magnesium/Indica, Toshiba.
Samsung will not push it for the time being because of the EVO drop event. Its 850Pro is the benchmark product in the industry, but it is too expensive. disco duro solidoSSD OEM32gb ram