Old Wang

Hello, I used a 64G SD card, why can my camera only store for 3 days?

Hello, after investigation, your camera’s bitrate is 2M variable bitrate for motion detection recording, and the storage for one day is about 5G. It is very likely that it is an expanded capacity card, and a test is needed?

TP-LINK

Old Wang

What is an expanded capacity card, and how do I test it?

￥%￥% expanded capacity card @#@# testing method #￥#￥#

TP-LINKMost cameras that use cards will pair with SD cards for local storage. The SD cards paired with surveillance cameras are required to have high read and write speeds, true capacity, and durable performance.However, the SD cards on the market vary in quality, filled with various fake cards, expanded capacity cards, low-speed cards, and counterfeit cards, which is not an exaggeration.Ordinary users also find it difficult to distinguish between genuine and fake cards based on appearance. Therefore, to make monitoring more reliable and secure, it is recommended to choose SD cards from well-known brands. For SD cards that have already been purchased (if storage issues arise), a test can be conducted.Below, I will tell you how to test and what indicators to look for. What are the common abnormal cards?Currently, there are three main types of fake cards commonly found on the market:How to determine if the SD card is abnormal?If the mobile app cannot recognize or format the SD card remotely, or if it drops the card/does not record after a period of use, you should first check whether the SD card is an abnormal card. It is recommended to use MyDiskTest software for testing.MyDiskTest is a computer testing tool that integrates expanded storage, data block damage detection, and read/write speed testing functions, which can effectively and intuitively detect whether the SD card is abnormal.Before testing, you need to prepare a card reader to facilitate the insertion of the SD card into the computer for testing. 1. Expanded Capacity TestThe results of the expanded capacity test are quite intuitive. When the SD card is detected as an expanded capacity card, there will be a text prompt and a red progress bar indicating that the SD card is an expanded capacity card;If it is not an expanded capacity card, the text prompt will say “Test Passed”. 2. Data Integrity TestThe SD card data integrity test mainly tests whether the SD card has bad blocks. When the test result shows that certain areas have red squares, it indicates that the SD card has bad sectors.As shown in the figure below:Red squares represent blocks where data verification failed, indicating that data cannot be written or read, which are bad blocks;Yellow squares represent blocks where test data has been written;Green squares represent blocks where data verification passed, indicating normal writing and reading of data. 3. Read/Write Speed TestThe read/write speed test mainly tests whether the actual read/write speed of the SD card meets Class 10/U1 standards. The characteristics of a normal SD card are:1. The read/write speed gradually increases with the increase of the horizontal coordinate block capacity, and finally stabilizes;2. The stable read/write speed is at 10MB/s or above.Other abnormal SD cards may have insufficient write speeds, as shown in the figure below.ReadWrite Speed Diagram *Since the duration of the expanded capacity test and read/write speed test is relatively short, while the data integrity test takes longer, it is recommended to prioritize testing the expanded capacity and read/write speed. Based on the test results, you can generally confirm whether the SD card is abnormal.For SD cards identified as abnormal through MyDiskTest, to ensure the safety of monitoring data and normal usage, it is recommended not to use them for monitoring storage and to replace them with normal SD cards.

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