Let's first understand what eMMC is. eMMC stands for Embedded MultiMediaCard, which is a microelectronic memory used to connect to mobile devices or electronic boards such as smartphones, tablets, digital cameras, or Raspberry Pi. It is small and has a high capacity from 2GB to 256GB without having to connect any more risks like SD Card and can be used like internal memory with a speed of reading and writing data at the speed of Flash Memory.

In terms of differences between SD Card and eMMC, there are advantages and disadvantages as follows:

SD Card :

Pros: Cheaper than eMMC and can easily be expanded by replacing with a larger SD card.

Disadvantages: Data corruption is easy because SD Card has a fragile structure and is prone to problems after long-term use. Reading and writing data may be slower than eMMC and has a lower write/read rate.

eMMC:

Advantages: It has higher reading and writing speeds than SD cards and is more stable. In addition, there is no problem of data corruption after long-term use.

Disadvantages: More expensive than SD cards, and if you want to add more memory, you have to replace the entire eMMC module, and it is not as easy to add more memory as SD cards.

Therefore, choosing between eMMC and SD Card in Raspberry Pi depends on your purpose and budget. If you want high read and write speed and have high budget, you should choose eMMC. But if you want value and convenience in adding memory, you should choose SD Card.

The Raspberry Pi CM4 has a Raspberry Pi Compute Module 4 that has a PCIe 1x Gen2 expansion slot on the exposed IO board for users, which can be used with various PCIe devices such as PCIe audio, PCIe network cards, PCIe graphics cards, and other PCIe-compatible devices.

Adding PCIe to the Raspberry Pi CM4 opens up the possibility of using more user-friendly capabilities, such as connecting directly to PCIe devices that support Linux or Windows. This is a great way to increase the performance and capabilities of the Raspberry Pi CM4 in applications such as gaming consoles or networking setups that can support faster network connections than other cables.

Installing a M.2 NVMe SSD in the Raspberry Pi CM4 requires a PCIe 1x Gen2 expansion card and additional add-on modules such as an IO Board that supports connecting an M.2 NVMe SSD via the M.2 connector, providing the flexibility to choose the right M.2 NVMe SSD for your needs.

However, adding an NVMe M.2 SSD still requires a higher budget than connecting other devices, and requires knowledge of installation and use to ensure proper and efficient operation.

A comparison table of SD Card, eMMC, and M.2 SSD usage in Raspberry Pi CM4 can be written as follows:

Therefore, choosing which one to use depends on the user's needs. For example, if you want a large capacity and high read/write speed, you should choose M.2 SSD. But if you want low cost and low capacity, you can choose SD Card as well.

We will compare the speed of SD Card VS SSD M.2 VS eMMC.

1. Start-up speed

2. Speed ​​of opening chromium + load + close

3. Read and write speed

From what we have read, both SSD, eMMC, SD Card have both advantages and disadvantages that are different in many aspects. But having many to choose from is a great thing for users like us.

Source: https://www.youtube.com/watch?v=4Womn10v71s&t=313s

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