Delkin Blog

SLC vs. MLC Performance: Quick Guide

 

MLC and SLC flash are both reliable, effective NAND flash storage solutions. The challenge that engineers and OEMs face is choosing the right type of storage for their needs. Some applications are best suited to MLC flash, while SLC is a requirement for others. If you are considering these types of flash storage, read through the following comparison of SLC vs. MLC performance:

 

Performance in Devices

MLC flash stores two bits of data per cell, while SLC stores one. MLC uses a smaller array size than SLC flash, which means that the device is smaller. This can be an advantage in terms of real estate and price, especially for applications where space is at a premium. However, the complexity of the read and program circuits required for MLC means that MLC doesn’t provide double the storage in half the space.

 

To store the extra bit of data, MLC flash cells require four quantities of charges on the floating gate in the device within the same voltage window as SLC. In order to achieve this, MLC must run a more complex and time-consuming algorithm every time data is stored. This need makes MLC flash slower than SLC—as much as four times slower for programming times and three times slower for read operations.

 

Overall System Performance

System performance is slower in MLC than SLC because MLC does not support copyback or partial programming. With copyback programming, pages of data can be moved within the flash device without transferring the data out of the memory. This process increases speed and helps with wear leveling as well as read and write operations. SLC has copyback programming, which makes it perform faster.

 

Partial programming involves programming part of a page of data, which speeds up small block transfers and read, modify, and write operations. However, MLC flash is sensitive to array disturbances, in which accessing part of an array can disrupt other parts of that same array. MLC does not feature partial programming in order to reduce the risk of array disturbances, but slower system performance is the result.

 

Endurance

SLC can perform more program/erase cycles than MLC. Typically, SLC flash can perform at least 70,000 program/erase cycles per cell without any issues. With MLC flash, that number is closer to 3,000 cycles. Although this reduction in endurance is problematic with some applications, MLC flash endurance is completely sufficient for many others.

 

Examining SLC vs. MLC performance to determine which option is best for your application can be challenging, but Delkin is here to help. We offer a range of storage solutions that can be customized to fit your application’s needs. Contact our product team today with your questions.

 

Contact

  • This field is for validation purposes and should be left unchanged.

Related Posts

What Is NAND Flash Storage?

If you’ve been searching for industrial grade memory, then you have likely encountered the...

Delkin Utility Products
Commonly Asked Questions about Flash Storage Device Options

  Flash storage devices are enormously popular across consumer, commercial, and industrial markets. Chances are...

Get the Facts about mSATA 256GB

  Are you considering an mSATA SSD for your device? mSATA refers to mini-SATA, which...

Understanding the Price of Data Failure

  Data security is a significant concern for anyone who uses anything from a smartphone...

Industrial Flash Storage in Flight Data Recorders

Flight data recorders are a key component of aviation safety. Information gleaned from flight...

Technical Success Story: Locked BOM Maximizes Performance and Speed

  A locked BOM, or bill of materials, is one of the key advantages to...

Taking a Closer Look at Data Reliability Testing

  When it comes to flash memory, reliability is key. This is especially true for...

Power Fail
What Is Intelligent Power Management?

  Power management is a critical issue for industrial applications and embedded storage for many...

Industrial CompactFlash
Spotlight on CF Industrial Cards

  CompactFlash, or CF, cards are one of the most popular and well known choices...

Infotainment in Car
What Is an Embedded Module?

  Within computer units, there are smaller systems that are designed to perform a single...