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How much do you know about compact flash, flash particles, and flash chips?

How much do you know about compact flash, flash particles, and flash chips?

August 14 , 2023 0

Compact Flash, a lightweight memory used in removable memory cards.CompactFlash cards are long-lasting and durable, with a low operating voltage and no data loss after power loss. Applications include: digital cameras, cellular phones, printers, PDAs, pagers, and recording devices.A type of memory card used in many digital cameras, Compact Flash cards store computer information such as text, pictures, and music, and can be copied, erased, and used multiple times.

In recent years, cell phone images have continued to develop, photos + videos occupy a lot of storage space, and in front of the increasingly expanding WeChat, handheld games and various APPs, 128GB storage is really not enough!
In 2023, if I were to recommend a cell phone, I would recommend 256GB, followed by 512GB and 1TB.

1 Understanding Mobile Flash Memory Specifications

2 eMMC

eMMC (embedded MultiMedia Card) is a flash memory standard developed by the MMC Association for cell phones and tablets, which originated even earlier than UFS and NVMe. eMMC is based on the development of MMC memory cards.
Based on the development of MMC memory card, eMMC is made by [parallel transmission] technology, and reading and writing must be executed separately. Although eMMC only provides a single read/write function, it still has the advantages of small size, high degree of integration, and low complexity.

At present, the latest eMMC 5.1 standard, continuous reading speed of about 250MB / S, in the current software, has been insufficient, at present, basically only a hundred dollars of low-end machine in use, for example, the end of 2022 launched the Redmi 12C, 4 + 64GB priced at 699 yuan!

3 UFS

UFS (Universal Flash Storage) was first introduced by JEDEC in 2011, and uses [serial transfer] technology to allow for simultaneous read and write operations.

The first generation of UFS was not successfully popularized due to the small difference in speed with the eMMC standard at the time, and the cost of the project was relatively high, so it did not succeed in popularizing it until 2014, when the UFS 2.0 standard was introduced, with a continuous read speed of about 800MB/S. UFS has gradually become the standard configuration that Android flagships will use.

In 2018, when UFS 3.0 was introduced, the continuous read speed was about 1,700MB/s, catching up with Apple's NVMe. 2022 will see the release of UFS 4.0, which will allow continuous read and write speeds of 3,400MB/s. In 2023, Android flagships will be released.
2023 release of Android flagships basically use UFS 4.0 this specification of flash memory, such as the Samsung S23 series vivo X90 series (in addition to the standard version of 8 + 128G), iQ00 11 series (in addition to the standard version of 8 + 128G), Xiaomi 13 series Redmax, and the Xiaomi 13 series Redmax.

4 NVMe

NVMe (NVM Express) is a flash memory standard for SSDs originally used in MacBooks, featuring high efficiency, low load, and low latency.

In 2015, Apple used NVMe flash memory for the first time on the iPhone 6S, and the continuous read speed at that time was about 500MB/s. Since most of the early Android phones used the eMMC 5.1 standard, the iPhone rode above the rest in terms of continuous read speed, which is also the biggest reason why the iPhone doesn't get stuck, and a cell phone can be used for 3-5 years. This is the biggest reason why the iPhone doesn't lag and a phone can last 3-5 years.

In addition to the use of NVMe flash memory, and Dong Guo A9 chip began to use the PCIE interface related to the follow-up of Apple's Wifi, baseband are using the PCIE interface, their own chip interface defined by themselves, other manufacturers really can not learn until the UFS 3.0 was introduced after the gradual narrowing of the gap between the two, the Apple's NVMe has been upgrading in the past few years, since the iPhone 6S will be nearly turned over 4 times. The NVMe has also been upgraded in the past few

years. The latest iPhone 14 Pro Max has a sequential read/write performance of around 1,500MB/s.

So in terms of sequential read/write performance: UFS 4.0 > NVMe = UFS3.1 > UFS2.1 > eMMC5.1

5 Impact of Different Flash Memory on Daily Use

In addition to the speed difference between different flash memory specifications for cell phones in terms of file reading and writing, UFS and NVMe use [Serial Transfer] technology to read and write cell phone data at the same time; whereas eMMC uses [Parallel Transfer] technology, which requires separate reading and writing operations, so when the phone is performing multi-tasking operations eMMC's response speed is higher than that of UFS and NVMe.

On the other hand, eMMC adopts the [parallel transfer] technology, which must perform read and write operations separately. Therefore, when a cell phone performs multitasking operations, the response speed of eMMC will be much slower than that of the UFS and

NVMe standards, which is also the reason why eMMC has been eliminated with the development of science and technology.

In addition, UFS and NVMe consume less power on average than eMMC.