Solid state hard disk will not have the problem of bad sectors, but there will be bad blocks
1, life expectancy problem, as far as the current solid state hard disk flash memory chip, the life expectancy will not be more than 5 years, a long time will naturally have a bad block, and it will be suddenly unusable.
2, the flash master chip problem, the flash master chip determines the performance of the solid state hard disk, if they have problems, then the whole hard disk will have problems.
Classification:
There are two types of storage media for SSDs, one uses flash memory (FLASH chips) as the storage media, and the other uses DRAM as the storage media.
1, flash-based category: flash-based solid state drive (IDEFLASH DISK, Serial ATA Flash Disk): the use of FLASH chips as a storage medium, which is also commonly referred to as SSD.
It can be made to look like a variety of molds, such as: laptop hard drive, microdisks, memory cards, flash drives and other style . The biggest advantage of this SSD solid state drive is that it is mobile and data protection is not controlled by the power supply, which makes it adaptable to a variety of environments and suitable for individual users.
Generally it erases the number of times generally about 3000 times, to commonly used 64G for example, in the balance of the SSD writing mechanism, the total amount of data that can be erased for 64G X 3000 = 192000G.
If you are a perverted video king every day like to download the video to watch the end of the deletion of the daily download of 100G, then the number of days available for 192000 / 100 = 1920, that is, 1920 / 100 = 1920, or 1920 / 366 = 5.25 years.
If you're just an average user who writes far less than 10G of data per day, take 10G to calculate, you can use it for 52.5 years without interruption, and then if you're using a 128G SSD, you can use it for 104 years without interruption! What kind of concept is this? It's like a regular hard disk HDD, theoretically unlimited read/write.
2, based on DRAM class:
DRAM-based SSD: DRAM as a storage medium, the scope of application is narrower. It emulates the design of traditional hard disks and can be used by the vast majority of operating system file system tools for volume setup and management.
And provides industry-standard PCI and FC interfaces for connecting to hosts or servers. Applications can be categorized as SSD drives and SSD drive arrays.
It is a high-performance memory and has a long service life, but the downside is that it requires a separate power supply to protect data security. DRAM SSDs are relatively non-mainstream devices.
Expanded Information
Solid State Drive
Solid State Drive (Solid State Drive), commonly known as SSD, is a hard drive made with an array of solid-state electronic storage chips, named for the solid capacitors called Solid in Taiwanese English.
SSD consists of a control unit and a storage unit (FLASH chip, DRAM chip). SSDs are identical to ordinary hard disks in terms of specification and definition of interfaces, functionality and usage, as well as in terms of product form factor and dimensions.
Widely used in military, automotive, industrial control, video surveillance, network monitoring, network terminals, electric power, medical, aviation, navigation equipment and many other fields.
The operating temperature range of its chips is wide, commercial-grade products (0~70℃) industrial-grade products (-40~85℃). Although the cost is higher, it is gradually popularizing to the DIY market.
Because SSD technology is different from traditional hard disk technology, it has given rise to a number of emerging memory manufacturers. Manufacturers can build SSDs by simply purchasing NAND memory and matching it with the appropriate control chip.
The new generation of SSDs commonly use the SATA-2 interface, SATA-3 interface, SAS interface, MSATA interface, PCI-E interface, NGFF interface, CFast interface and SFF-8639 interface.
References
Baidu Encyclopedia - Solid State Drives