RAISE and DuraWrite - technologies for increasing the service life and reliability of SSD drives
Reference post. Reporting to the end-users information about how the manufacturer cares about them is the key task of any player in the component market. We will not make an exception from Kingston and, under the cut, we will reveal a few secrets (and maybe quite obvious things to someone) about RAISE and DuraWrite technologies - important components of the reliability of Kingston solid-state drives.
In order to avoid misunderstandings, I will say the technologies are built into the controller of the LSI SandForce and are not the merit of Kingston alone.
What is the principle of technology? The greater the amount of recorded data - the shorter the service life of the SSD. It is obvious.
How to reduce the amount of data? Option one is not to turn on the computer (ha ha, that was a joke) . Option two - compress data before recording.
As practice shows, most popular data formats are highly compressible. Of course, there are mp3, jpg, which are initially compressed. It is difficult to deal with new formats of MS Office - there has been optimization at the software level, but for example html, old Office, exe, pdf - that is, the files that we meet every day will be well reduced in size with appropriate processing.
The LSI SandForce controller can compress data before writing to a solid-state drive.
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Kingston SSDs typically have about 7% additional NAND flash memory reserved for use by the SSD controller (therefore, a 120GB capacity is indicated for 128GB SSDs; the same is true for 240GB / 256GB and 480GB / 512GB SSDs). This backup area is used to support SSD controller operations.
However, due to the DuraWrite data compression technology, a smaller amount of data written to the NAND flash drive creates a dynamic spare area by freeing up additional spare area space.
Suppose we have a standard 256GB SSD, 80% full of operating system, applications and user data. SSD has 20% free space used by the SSD controller as a dynamic backup area. Now let's take the same SSD with DuraWrite data compression technology and compare them:
Both SSDs have a standard 256GB SSD capacity (indicated as a dark green “Backup Area” field) and a free space area used as a dynamic backup area for both types of SSDs.
However, for SSDs with DuraWrite data compression (right), the volume occupied by the operating system, applications, and part of the user data (compressible) is smaller, which leads to a decrease in the capacity of the NAND used to store data on the SSD. Although both SSDs have 20% free space, the right-hand SSD with DuraWrite technology has an incremental dynamic spare area that it can use to improve the performance and service life of the SSD compared to the standard SSD shown on the left.
This technology stands for Redundant Array of Independent Silicon Elements (Failsafe array of independent silicon elements).
It is needed in order to reduce the number of uncorrectable errors when writing to a solid-state drive. In fact, this is another level of error protection on top of the ECC correction system.
In some ways, RAISE is similar to RAID for hard drives, only data is written not to different devices, but to different memory chips.
You can learn more about it by watching a video in which colleagues from the R'n'D Department talk about RAISE
In order to avoid misunderstandings, I will say the technologies are built into the controller of the LSI SandForce and are not the merit of Kingston alone.
Durawrite
What is the principle of technology? The greater the amount of recorded data - the shorter the service life of the SSD. It is obvious.
How to reduce the amount of data? Option one is not to turn on the computer (ha ha, that was a joke) . Option two - compress data before recording.
As practice shows, most popular data formats are highly compressible. Of course, there are mp3, jpg, which are initially compressed. It is difficult to deal with new formats of MS Office - there has been optimization at the software level, but for example html, old Office, exe, pdf - that is, the files that we meet every day will be well reduced in size with appropriate processing.
The LSI SandForce controller can compress data before writing to a solid-state drive.
')
Reserve area and dynamic reserve area
Kingston SSDs typically have about 7% additional NAND flash memory reserved for use by the SSD controller (therefore, a 120GB capacity is indicated for 128GB SSDs; the same is true for 240GB / 256GB and 480GB / 512GB SSDs). This backup area is used to support SSD controller operations.
However, due to the DuraWrite data compression technology, a smaller amount of data written to the NAND flash drive creates a dynamic spare area by freeing up additional spare area space.
Suppose we have a standard 256GB SSD, 80% full of operating system, applications and user data. SSD has 20% free space used by the SSD controller as a dynamic backup area. Now let's take the same SSD with DuraWrite data compression technology and compare them:
Both SSDs have a standard 256GB SSD capacity (indicated as a dark green “Backup Area” field) and a free space area used as a dynamic backup area for both types of SSDs.
However, for SSDs with DuraWrite data compression (right), the volume occupied by the operating system, applications, and part of the user data (compressible) is smaller, which leads to a decrease in the capacity of the NAND used to store data on the SSD. Although both SSDs have 20% free space, the right-hand SSD with DuraWrite technology has an incremental dynamic spare area that it can use to improve the performance and service life of the SSD compared to the standard SSD shown on the left.
RAISE
This technology stands for Redundant Array of Independent Silicon Elements (Failsafe array of independent silicon elements).
It is needed in order to reduce the number of uncorrectable errors when writing to a solid-state drive. In fact, this is another level of error protection on top of the ECC correction system.
In some ways, RAISE is similar to RAID for hard drives, only data is written not to different devices, but to different memory chips.
You can learn more about it by watching a video in which colleagues from the R'n'D Department talk about RAISE
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Source: https://habr.com/ru/post/366593/
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