Compared with ordinary hard disks, solid-state hard disks have the following advantages: 1. Quick start, no process of motor accelerating rotation. 2. No magnetic head, fast random reading and minimum reading delay. According to related tests, under the same computer configuration, it only takes 18 seconds for a notebook with solid-state hard disk to appear on the desktop, while it takes 3 1 second for a notebook with traditional hard disk, almost half the difference. 3. Relatively fixed reading time. Because the addressing time is independent of the data storage location, disk fragmentation will not affect the reading time. 4. The writing speed of solid-state hard disk based on DRAM is extremely fast. 5. There is no noise. Because there is no mechanical motor and fan, the noise value is 0 decibel when working. Some high-end or large-capacity products are equipped with fans, so it will still produce noise. 6. Low-capacity solid state drives based on flash memory have low energy consumption and calorific value, but high-end or large-capacity products have high energy consumption. 7. There are no mechanical moving parts inside, so there will be no mechanical failure and no fear of collision, impact and vibration. In this way, the normal use of the notebook computer will not be affected even if it moves at high speed or even tilts, and the possibility of data loss can be minimized when the notebook computer accidentally falls or collides with hard objects. 8. Wider operating temperature range. A typical hard disk drive can only work in the range of 5 to 55℃. But most SSDs can work at-10~70℃, and some industrial SSDs can also work at -40~85℃ or even higher (for example, the temperature of Runxin military products is -55~ 135℃). 9. Low-capacity SSDs are smaller and lighter than SSDs with the same capacity. However, this advantage gradually weakens with the increase of capacity. Up to 256GB, SSD is still lighter than ordinary HDD with the same capacity.
Compared with traditional hard disks, solid-state hard disks have the following disadvantages: 1. High cost. The price per unit capacity is 5~ 10 times (based on flash memory) or even 200~300 times (based on DRAM) of the traditional hard disk. 2. Low capacity. At present, the maximum capacity of SSD is much lower than that of traditional HDD. The capacity of traditional hard disks is still growing rapidly. It is said that IBM has tested a 4TB traditional hard disk. 3. Because it is not shielded in faraday cage like the traditional hard disk, the solid-state hard disk is more susceptible to some external factors. Such as power failure (especially the solid-state hard disk based on DRAM), magnetic field interference, static electricity, etc. 4. The writing life is limited (based on flash memory). The write life of general flash memory is 1 0,000 to 1 0,000 times, and that of special flash memory can reach 1 0,000 to 5,000 times. However, some parts of the file system, such as the file allocation table, will still exceed this limit throughout the life cycle of the computer. The dedicated file system or firmware can share the write location, so that the overall life of the SSD can reach more than 20 years. 5. It is difficult to recover data after it is damaged. Once the hardware is damaged, if it is a traditional disk or tape storage method, some data may be saved through data recovery. But if it is solid-state storage, once the chip is damaged, it is almost impossible to retrieve the data in the chip that is broken into several petals or broken by current. Of course, this deficiency can also be made up by sacrificing storage space. The principle of backup mainly realized by RAID 1 is the same as that of traditional storage backup. Because the cost of SSD is very high at present, this way of backup is still relatively expensive. 6. According to the actual test, the battery life of the notebook computer using solid-state hard disk is shorter than that of the 2.5-inch traditional hard disk using 5400RPM under idle or low load operation. 7. The energy consumption of the solid-state hard disk based on DRAM is higher than that of the traditional hard disk at any time, especially when it is turned off, or the data will be lost. 8. According to user feedback, SSD using MLC will appear suspended animation when running under Windows XP system. This is because the file system mechanism of Windows XP system is not suitable for SSD. In Windows 7, SSD is optimized, and traditional hard disk mechanisms such as SuperFetch, ReadyBoost, startup and program prefetch are disabled, which can give full play to the performance of SSD.