Preface
U disk is one of the most common flash memory devices in our daily work and life. Although it can only temporarily store a small number of files, its lightweight and portable characteristics have not affected it to become a necessity for people at all.
However, most USB drives only have one USB-A interface, so it is of course no problem to use a PC for storage frequently, but it will be a bit troublesome if you need to use a mobile phone or iPad to read the data in the USB drive. Even if it can be achieved using OTG wire or external docking station, dragging a long wire is inevitably a bit cumbersome. The popularity of
Type-C interface has enabled USB flash drives to have dual interface functions, with the interface in place and doubled the experience. The dual-interface USB drive provides convenience for us to work and browse videos with mobile phones. Recently, the author has acquired a dual-interface USB drive - SanDisk SDDDC4. This USB drive has excellent portability and efficiency without network environment, cross-device, large file transfer, etc.
product unboxing
SanDisk SDDDC4 U disk implements the concept design of minimalist in appearance. The total length is only 4cm, which is much smaller than the size of a regular U disk. The shell is made of zinc alloy , with a delicate surface texture. On the other hand, the metal shell can also play a role in wear resistance and fall resistance, preventing sudden drops and wear from affecting internal components.
U disk is a bright silver design, with a silver coating covering showing a high-end texture. The front of the USB disk is printed with the logo logo of SanDisk . The back of
is related to the USB disk model and storage capacity. In terms of
interface, since many thin and light laptops are no longer equipped with USB-A interface, they often need adapter to connect to USB drives. Therefore, dual-interface USB disks are very popular, and multi-interfaces are very convenient to use, so that data can be easily transmitted back and forth before the PC and the laptop.
SanDisk SDDDC4 U disk adopts a dual-interface rotation design. The dual-interface conversion only requires one pull and one rotation, which is convenient for operation. The damping feel is moderate when rotating, and it can easily be opened and closed. The USB-A port can be used for ordinary PCs, while the Type-C interface can be directly plugged into mainstream laptops, mobile phones, tablets and other related devices, making it efficient and flexible.
After connecting the USB drive to your phone or iPad, you can directly preview the files in the USB drive. In the past, files were required to be sent to your mobile phone or iPad via WeChat. Now, you only need to copy the files to the USB flash drive and then transfer them to the device to preview directly, which greatly saves time and costs, avoids excessive space occupation, and is faster to transfer and more convenient to use.
As for performance, no matter how many interfaces there are, it is useless if there are no excellent transmission performance. The USB-A port and Type-C interface of SanDisk SDDDC4 USB drive both support USB3.2Gen1 protocol, and is backward compatible with USB3.0/USB2.0 and other transmission protocols. It can realize 150MB/s reading speed, and no matter how large the file is, it can be quickly transferred. 2G-sized files can be completed in just 10 seconds.
As a major storage manufacturer, SanDisk strictly controls product quality. SanDisk SDDDC4 USB drive also has a 5-year warranty. Users do not need to worry about quality and cause data storage problems. They can save precious content with confidence.
Performance Test
After briefly introducing the appearance of SanDisk SDDDC4 USB disk, the following is to enter the performance testing process. We will conduct performance evaluation from two dimensions: theoretical performance testing and practical performance testing. In addition, in order to ensure sufficient bandwidth, the USB drive was inserted into the Type-C interface with USB3.2Gen2 rate during the test for testing.
TxBENCHTheoretical performance test
The first TxBENCH theoretical performance test is carried out. Through TxBENCH, the basic information of the SanDisk SDDDC4 U disk can be viewed, with a capacity of 28.65GB, which meets the normal capacity range of the 32GB U disk, and the supported protocols are also quite complete.
followed by TxBench benchmark test. The SanDisk SDDDC4 U disk can reach 155.680MB/s in Q32T1 sequential reading, and the Q32T1 sequential writing speed is 24.598MB/s, which basically meets the official nominal value.
CrystalDiskMark Theoretical Performance Test
In the classic software for testing storage devices, we use 1GB data packets for testing. The continuous reading speed of the SanDisk SDDDC4 U disk reaches 159.2MB/s, and the continuous writing speed is 24.28MB/s, which is not much different from the TxBENCH test results. This performance is easy to use to transfer large files.
AnvilsStorageUtilitiesUtilitiesTheoretical performance test
Anvil’sStorageUtilities is also a software specializing in testing storage devices. In the benchmark test, the SanDisk SDDDC4 U disk obtained a total score of 439.95, of which the read score was 396.27 points, the write score was 43.67 points, and the read and write performance was 148.22MB/s and 29.52MB/s, respectively.
ezIOmeter Theoretical Performance Test
is similar to CrystalDiskMark. ezIOmeter is also a theoretical read and write speed test software, but ezIOmeter can see more detailed data, such as the minimum read and write speed and the maximum read and write speed. In the theoretical performance test, the SanDisk SDDDC4 U disk measured that the sequential read performance is 138.55MB/s and the sequential write performance is 17.59MB/s.
ATTODiskBenchmark theory performance test
ATTODiskBenchmark software is mainly used to test the read and write performance of USB disks to fragmented files, and the benchmark range for testing the size of the transferred file is between 512B and 64MB. It can be seen from the test results that when the file exceeds 512KB, the SDDDC4 U disk can perform the best speed, and even a 64KB file can have a reading speed of more than 100MB/s, which is definitely enough for daily office work.
DiskSpeedThestTheoretical Performance Test
Blackmagicdesign can detect the read and write performance of storage devices from the perspective of video frame rate and format. The reading speed of the SanDisk SDDDC4 U disk is 151MB/s and the writing speed is 60.9MB/s. The support for the H.265 format is also quite complete, and it can basically meet the video transmission of 8K60 frames.
Practical application
Compared with theoretical performance tests, actual performance can reflect the performance of the USB flash drive more intuitively. In actual tests, we simulate the scenario where the creator copys the material, first transfer the files stored in the computer to the USB flash drive to record the time and transmission performance; then transfer the files in the USB flash drive back to the computer, and record the time and transmission performance again to compare.
is selected here to test a 2.5GB movie file. It takes about 1 minute to copy it from the local hard drive to SanDisk's SDDDC4 USB drive. The overall time is about 1 minute. The first half of the transmission process can be transmitted at a speed of 58MB/s. Even the average transmission speed in the second half is about 25MB/s. The write speed curve is very stable and the overall stability is good.
In the more common scenarios of copying USB data to computers, SanDisk SDDDC4 USB drive performs better. From the data point of view, it remains at around 150MB/s almost the entire process, and copying data of about 1.5GB can only take 10 seconds. The excellent read and write performance makes it suitable for various usage scenarios.
Summary
In general, the U disk of SanDisk SDDDC4 performs well in transmitting data. Even if it is transferred for a long time, the reading and writing speed has not been significantly reduced. It has good stability. Its compact, exquisite and portable features are combined with good reading and writing performance, allowing this USB disk to easily cope with various scenarios, suitable for students, editors or office workers.
all-metal body design not only effectively protects the USB flash drive, but also assists the USB flash drive to dissipate heat, playing a dual protection role. In addition, the dual interface design allows data transmission between different devices to be easily handled with a single USB flash drive, with rich application scenarios. Assuming you have a demand for a dual-interface USB drive, SanDisk is definitely a good choice, and it is a good helper for mobile storage .
