What SD card is best for a dash cam?

When choosing the best SD card for a dash cam, several factors are essential to ensure reliability, durability, and optimal performance. Since dash cams continuously write large amounts of data, a high-quality, durable SD card is crucial. 

1. Dash Cam SD Card Requirements

A. Continuous Writing

Dash cams record continuously when the vehicle is in use, which means the SD card is constantly writing data. Standard SD cards aren’t built for continuous use and can wear out quickly when subjected to this level of writing. That’s why dash cams need SD cards that are designed for high endurance and long-lasting performance.

B. High-Endurance Cards

The best SD cards for dash cams are typically labeled as “high endurance” or “industrial grade.” These cards are designed to withstand the constant writing and overwriting that comes with dash cam use. They’re built to handle intensive data cycles, ensuring they don’t fail when you need them most.

C. Capacity vs. Quality

Many users assume that the largest capacity SD card is the best choice, but this isn’t always the case. While having a large capacity means you can store more footage before the oldest files are overwritten, what’s more important is the quality of the card. A high-endurance card with a smaller capacity can often outlast a larger, standard card.

2. Key Factors to Consider

A. Capacity

The capacity of the SD card you choose depends on how much footage you want to store and how high the resolution of your dash cam is. Here’s a rough guideline:

32GB SD Card: Records around 3-4 hours of 1080p HD video.

64GB SD Card: Stores about 6-8 hours of 1080p HD footage.

128GB SD Card: Can store 12-16 hours of 1080p HD footage.

Most dash cams overwrite the oldest files once the card is full, so storage capacity dictates how far back you can go when reviewing footage. Higher capacities, such as 256GB or 512GB, are available, but they may not be compatible with all dash cams.

B. Speed Class

Dash cams require SD cards that can write data at a sufficient speed to capture high-definition video without lag or interruption. SD cards are rated by their speed class, which indicates how fast they can write and transfer data. The most common speed classes are:

Class 10: Minimum write speed of 10MB/s.

UHS (Ultra High Speed) Class 1 (U1): Minimum write speed of 10MB/s, but better optimized for continuous video recording.

UHS Class 3 (U3): Minimum write speed of 30MB/s, necessary for 4K video recording.

For a dash cam, especially one recording at high resolutions such as 1080p or 4K, a card rated at Class 10 or U1 is generally recommended, though U3 might be necessary for 4K dash cams.

C. Endurance and Durability

Durability is crucial because the SD card is exposed to high heat, especially in a vehicle that might be parked in the sun. Look for cards specifically marked as:

High-Endurance: These cards are built for continuous recording and are designed to last longer than standard cards.

Temperature Resistant: Designed to withstand extreme temperatures, usually between -25°C and 85°C, these are ideal for dash cams exposed to harsh weather.

Waterproof: Helps protect the card if exposed to moisture or high humidity.

X-ray and Shockproof: Ensures data protection from X-ray machines and physical shocks.

3. Best SD Card Types for Dash Cams

Based on the above factors, here are some recommended SD cards for dash cams:

A. SanDisk High Endurance Video Monitoring Card

Capacity Options: 32GB, 64GB, 128GB, 256GB

Speed: Class 10. U3 (up to 100MB/s read speed)

Special Features: High endurance for long-lasting performance; designed for dash cams and home monitoring systems.

Durability: Temperature-proof, waterproof, X-ray proof, and shockproof.

SanDisk is a well-known brand, and their High-Endurance line is specifically designed for use in dash cams. These cards can withstand continuous recording, even at high temperatures, and have been tested for reliability.

B. Samsung PRO Endurance

Capacity Options: 32GB, 64GB, 128GB, 256GB

Speed: Class 10. U3. up to 100MB/s read speed.

Special Features: Can record continuously for up to 43.800 hours (with 128GB model); excellent for high-resolution video.

Durability: Built to withstand harsh conditions, including extreme temperatures, magnet-proof, X-ray proof, and waterproof.

The Samsung PRO Endurance series is widely regarded as one of the best choices for dash cams. It’s specifically built for extended recording, making it perfect for users who need long-lasting performance.

C. Transcend High Endurance

Capacity Options: 32GB, 64GB, 128GB

Speed: Class 10. U1. with a write speed of up to 30MB/s.

Special Features: Built for continuous video recording; ideal for dash cams.

Durability: Resistant to extreme temperatures, water, static, and shocks.

Transcend’s High Endurance SD cards are another reliable option for dash cam users. While their write speed is lower than some competitors, they are known for their longevity and durability.

D. Kingston High Endurance

Capacity Options: 32GB, 64GB, 128GB, 256GB

Speed: Class 10. U1. up to 95MB/s read and 45MB/s write.

Special Features: Optimized for dash cams and security cameras, ensuring consistent performance over time.

Durability: Withstands extreme temperatures, water, shock, and vibration.

Kingston is known for making durable, reliable memory products, and their High-Endurance cards are designed to handle the constant demands of dash cam recording.

4. Compatibility with Dash Cams

Before purchasing an SD card, always check the compatibility with your specific dash cam model. Most dash cams have specific recommendations in the user manual regarding the maximum SD card capacity and required speed class. Some older dash cams may not support SD cards over 64GB, while newer models may handle up to 256GB or even 512GB.

Additionally, the format of the SD card (FAT32. exFAT, etc.) can affect compatibility. Many dash cams use the FAT32 file system, which supports SD cards up to 32GB, but for larger capacities (64GB and above), you may need to format the card to exFAT.

5. Maintaining and Formatting Your SD Card

Regular maintenance and formatting of the SD card are necessary to ensure continued optimal performance. Over time, the card may develop fragmented files that slow down the write speed, leading to potential loss of footage.

Regular Formatting: Dash cam manufacturers recommend formatting the SD card at least once a month. Most dash cams have a built-in formatting option for convenience.

Replace the Card When Necessary: Even high-endurance SD cards have a lifespan, usually rated in total hours of recording. As the card approaches its limit, you may notice corrupted files or lost footage. Replace the card as soon as these signs appear.

6. How to Avoid Fake SD Cards

With so many brands and sellers, counterfeit SD cards are a common problem. These fake cards often claim higher capacities than they actually have and can fail under the heavy workload of dash cams. To avoid buying counterfeit cards:

Buy from Reputable Retailers: Purchase from official stores, trusted online retailers, or directly from the manufacturer.

Check Reviews: Look at user reviews to spot patterns of fake cards.

Test the Card: Tools like H2testw or F3 can verify the true capacity and performance of your SD card.

7. Price vs. Performance

While it may be tempting to go for a cheaper card, the investment in a high-quality, high-endurance SD card is well worth it for dash cam use. Skimping on the SD card can lead to premature failure, lost footage, or corrupted files when you need them most. The higher price of a durable, endurance-focused card is a small cost compared to the potential issues caused by a lower-quality product.

Choosing the best SD card for a dash cam is a matter of balancing capacity, speed, and durability. The continuous recording demands of a dash cam require an SD card designed for endurance and high-speed writing. Based on various criteria, the Samsung PRO Endurance and SanDisk High Endurance are among the top choices, offering long-lasting, reliable performance. Other notable options include Transcend High Endurance and Kingston High Endurance, which are built to withstand the rigors of constant recording.

Ultimately, investing in a high-quality SD card is essential for ensuring that your dash cam operates efficiently and that your critical footage is securely stored. Regular maintenance, such as formatting the card, combined with purchasing from reputable brands, will help prolong the life of the SD card and maintain the performance of your dash cam system.