Why SSDs Are Big And Cheap
Techquickie
5 min, 6 sec
The video discusses the reasons behind the increased storage capacity and decreased cost of SSDs over the years, focusing on NAND cell technology and its implications on speed and longevity.
Summary
- SSDs have greatly increased in storage capacity over the years due to advancements in NAND cell technology.
- The number of bits a cell can hold is key to both the capacity and performance of an SSD.
- More bits per cell result in higher capacity but lower speed and longevity due to increased error rates and electron leakage.
- Caching with DRAM or SLC, and stacking NAND cells vertically are methods used to counteract speed issues.
- Future PLC technology may offer increased storage but could face challenges in speed and longevity.
Chapter 1
The video begins by highlighting the significant increase in SSD storage capacity over the past 14 years.
- In 2009, 32GB of storage was expensive, but now vastly more storage is available at a lower cost.
- The reason for this change is advancements in NAND cell technology.
Chapter 2
NAND memory and cells are explained, including their role in data storage and the trade-offs of higher capacity cells.
- NAND is a type of memory used in SSDs, with cells as the smallest unit.
- Cells can hold between one and five bits, impacting the capacity and performance of the SSD.
- More bits per cell increase capacity but decrease speed and longevity due to greater error rates and electron leakage.
Chapter 3
Methods to improve SSD speed despite increased bits per cell, including caching and NAND stacking, are discussed.
- Caching with high-speed DRAM or by using a portion of the SSD as fast SLCs helps maintain high speeds for short operations.
- Data density is increased by stacking cells vertically, avoiding slower cell levels.
Chapter 4
The video explores upcoming PLC SSD technology and its potential impacts on storage and performance.
- PLC SSDs, capable of holding 5 bits per cell, may arrive by 2025 but face challenges in performance and longevity.
- PLC technology may not be suitable for users with high write demands, such as content creators or gamers.
Chapter 5
The video concludes with a call to action, asking viewers to engage with the content and subscribe to the channel.
- The video ends by encouraging viewers to like, dislike, comment, and subscribe.
- Viewers are reminded to follow and engage with the channel for more content.