What are ssd and hdd? What is the difference?

Ssd: Solid-state hard disk, referred to as hard disk. Solid-state hard disk is a hard disk made of solid-state electronic memory chip array, which consists of control unit and storage unit (FLASH chip and DRAM chip). Solid-state hard disk is exactly the same as ordinary hard disk in terms of interface, function and usage, and the product shape and size are also exactly the same as ordinary hard disk.

Its advantage is that it is fast, and daily reading and writing are dozens of times and hundreds of times faster than mechanical hard disks. The disadvantage is that the unit cost is high and it is not suitable for mass storage.

Hdd: hard disk drive, which is the most basic computer memory. It is often said that computer hard disks C and D are disk partitions and belong to hard disk drives.

Its advantage is low unit cost, suitable for mass storage, but its speed is far less than SSD.

Extended data:

Advantages of SSD:

1, fast reading and writing speed: using flash memory as storage medium, the reading speed is faster than that of mechanical hard disk. Solid state hard disk does not need a magnetic head, and the seek time is almost zero. The continuous writing speed is amazing, and most SSD manufacturers will claim that their SSD continuous reading and writing speed exceeds 500MB/s! The speed of SSD is not only reflected in continuous reading and writing, but also the ultimate meaning of SSD, which is directly reflected in most daily operations.

Associated with this is extremely low access time. The most common seek time of 7200 rpm mechanical hard disk is 12- 14 ms, while solid state hard disk can easily reach 0. 1 ms or even lower.

2. Anti-shock and anti-fall: The traditional hard disk is disk-type, and the data is stored in disk sectors. SSD uses flash particles (such as mp3, U disk and other storage media), so there are no mechanical parts inside SSD, even if it moves at high speed or even tilts over, it will not affect normal use, and the possibility of data loss can be minimized in the case of collision and vibration. Compared with traditional hard disks, solid-state hard disks have absolute advantages.

3. Low power consumption: SSD consumes less power than traditional HDD.

4. No noise: the solid state hard disk has no mechanical motor and fan, and the noise value is 0 dB when working. Solid state drives based on flash memory have low energy consumption and low calorific value (but high-end or large-capacity products will have high energy consumption). There are no mechanical moving parts inside, so there will be no mechanical failure and no fear of collision, impact and vibration. Because the solid-state hard disk uses flash memory chips and has no mechanical parts, it has the characteristics of low calorific value and fast heat dissipation.

5. Wide operating temperature range: A typical hard disk drive can only work in the range of 5 to 55 degrees Celsius. Most SSDs can work at-10~70 degrees Celsius. Solid state drives are smaller and lighter than mechanical hard drives with the same capacity. The interface specification, definition, function and usage of solid-state hard disk are the same as those of ordinary hard disk, and the product shape and size are also the same as those of ordinary hard disk. The working temperature range of the chip is very wide (-40~85 degrees Celsius).

6. Lightweight: SSD is lighter, 20-30g lighter than conventional 1.8 inch HDD.

References:

Baidu encyclopedia -SSD Baidu encyclopedia -HDD