SD Cards Explained! What do all of those symbols mean ? How to choose the right one for you.
Summary
TLDRIn this video, Lon Seidman takes a deep dive into the world of SD cards, explaining the different symbols, numbers, and types found on them. He covers essential topics like card capacity (SDHC vs SDXC), speed ratings, and the differences between UHS-1, UHS-2, and UHS-3 cards. Lon also clarifies how to choose the right card for your device, emphasizing the importance of sustained write speeds for video recording. The video concludes with recommendations on reliable brands and tips on getting the best performance from your SD cards, helping viewers make informed purchasing decisions.
Takeaways
- 😀 SD cards come in two main sizes: microSD and full-sized SD, with microSD being smaller and often coming with an adapter for full-sized card use.
- 😀 SD cards are categorized into SDHC (up to 32GB) and SDXC (up to 2TB) based on their storage capacity. Older devices may not support SDXC, so it's important to check compatibility.
- 😀 UHS (Ultra High Speed) cards are divided into three classes: UHS-I, UHS-II, and UHS-III. UHS-II and UHS-III offer faster write speeds, but UHS-I cards are still compatible with most devices.
- 😀 UHS-II cards have additional pins compared to UHS-I cards, allowing for faster data transfer speeds, especially when used with compatible readers.
- 😀 SD cards come with speed ratings such as V30, U3, and Class 10. These ratings indicate sustained write speeds, crucial for video recording or other high-data applications.
- 😀 A V30 rating means the card can sustain write speeds of 30MB/s, while higher numbers like V90 indicate even faster speeds for more demanding applications.
- 😀 It's important to match the speed rating of the SD card to the requirements of your camera or device. For example, 4K cameras may need cards that can sustain at least 30MB/s.
- 😀 The marketing speeds often refer to read speeds, not write speeds. Always verify the write speed rating before purchasing for video or heavy data use.
- 😀 High-endurance SD cards are ideal for applications with constant writing, like dash cams and security cameras, as they have a longer lifespan for frequent writes.
- 😀 Name-brand SD cards from companies like SanDisk, Sony, and Samsung tend to be more reliable and come with better warranties, which makes them worth the extra cost for mission-critical applications.
Q & A
What are the two main physical sizes of SD cards?
-The two main physical sizes of SD cards are microSD cards and regular SD cards. MicroSD cards are smaller and can be used with an adapter to fit into regular SD card slots.
What is the primary difference between SDHC and SDXC cards?
-The primary difference between SDHC and SDXC cards is their storage capacity. SDHC cards can store up to 32GB, while SDXC cards can store up to 2TB.
Can SDXC cards be used in older devices?
-No, older devices that do not support SDXC cards will not be compatible. It's important to check the device manual to confirm whether it supports SDXC or only SDHC.
What is the emerging SD card standard for higher capacities?
-The emerging standard is SDUC, which allows SD cards to support capacities up to 128TB, offering better performance than older standards.
What do the Roman numerals on SD cards (UHS-1, UHS-2, UHS-3) indicate?
-The Roman numerals on SD cards indicate the UHS (Ultra High Speed) standard. UHS-1 cards are slower than UHS-2 and UHS-3 cards, with UHS-3 offering the fastest data transfer speeds.
How do UHS-2 and UHS-3 cards differ from UHS-1 cards in terms of physical design?
-UHS-2 and UHS-3 cards have additional pins compared to UHS-1 cards, which allows for faster data transfer speeds. However, UHS-2 and UHS-3 cards are backwards compatible with devices that only support UHS-1.
What are the different speed ratings (V30, U3, V90) on SD cards, and what do they represent?
-Speed ratings such as V30, U3, and V90 represent the sustained write speeds of SD cards, measured in megabytes per second (MB/s). For example, a V30 card can write at 30 MB/s, while a V90 card can write at 90 MB/s.
What is the difference between megabits per second (Mbps) and megabytes per second (MB/s) when evaluating SD card speeds?
-Megabits per second (Mbps) is a measure of data transfer speed, while megabytes per second (MB/s) is 8 times larger. To convert from Mbps to MB/s, divide by 8.
How should you determine the right SD card speed for your camera?
-To choose the right SD card speed, you need to check your camera's bit rate requirements, then ensure that the SD card's sustained write speed meets or exceeds that requirement.
Why are name-brand SD cards (like SanDisk, Sony, Samsung) recommended over generic ones?
-Name-brand SD cards are recommended because they tend to be more reliable, offer better warranties, and are generally higher quality, reducing the risk of data loss or failure, especially for mission-critical applications.
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