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--- memorycards [2019.12.14 04:51] – Steve Isenberg
+++ memorycards [2024.11.12 15:56] (current) – Steve Isenberg
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+~~NOCACHE~~ //<fc #a0a0a0><fs small>This page last changed ~~LASTMOD~~ Visits: [{{counter|today| time| times}} today, {{counter|yesterday| time| times}} yesterday, and {{counter|total| time| total times}}]</fs></fc>//
 =====Memory Cards Info=====
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   - **microSDUC**: Supports cards up to 128TB, and will require a compatible device.
+{{:choosingsdcards.png?400 |}}
 Speed Class
   *     **Class 2**: At least 2MBps.
@@ Line 35: / Line 37: @@
 This diagram comes from MakeUseOf at the URL above.\\
-{{:choosingsdcards.png?500|}} The SD Card Association recommends U3 or better for 4K video. If your card's write speed is too slow, it will drop frames and produce stuttering video.
+The SD Card Association recommends U3 or better for 4K video. If your card's write speed is too slow, it will drop frames and produce stuttering video.
+|Workload|Min Write Speed|Rating|
+|8K video @ 60/120 FPS| 60MB/s|V90 or V60|
+|1080p/4K video @ 60/120 FPS|30MB/s|V30, U3|
+|720p/1808p/4K video|10MB/s|Class 10, V10, U1|
+|720p/1080p video, 4K video possible|6MB/s|V6, Class 6|
+This info from [[https://www.makeuseof.com/tag/best-fastest-microsd-cards/]]
+==== Measuring Transfer Speeds Between Your MacBook and Thumb Drives ====
+//This information provided by ChatGPT 11/12/2024//
+To measure transfer speeds between your MacBook and various thumb drives, you can use benchmarking tools that provide detailed read and write speeds. Here are some effective methods and tools:
+=== 1. Blackmagic Disk Speed Test ===
+  * **About**: Blackmagic Disk Speed Test is a popular, free utility for macOS users to measure the performance of external storage devices.
+  * **How to Use**:
+    - Download it from the Mac App Store.
+    - Open the application and select your thumb drive as the target disk.
+    - Click “Start” to begin the test, which will show both read and write speeds.
+  * **Advantages**: Simple and quick to use, with a clear display of read and write speeds. Good for comparison across different drives.
+  * **20241112: this is not working for thumb drives on my MacBook Pro. I selected a thumb drive and clicked Start; nothing happened.**
+=== 2. AJA System Test Lite ===
+  * **About**: AJA System Test Lite is a popular benchmarking tool designed to measure the performance of storage devices, widely used by video professionals.
+  * **How to Use**:
+    - Download AJA System Test Lite from AJA’s website (it’s free).
+    - Select your thumb drive as the target and specify the test file size (1GB is a common choice).
+    - Start the test, which will show sequential read and write speeds.
+  * **Advantages**: Offers more configuration options than Blackmagic, allowing you to test different file sizes and formats.
+=== 3. Terminal Commands (Using dd) ===
+  * **About**: If you prefer a command-line approach, you can use the `dd` command in Terminal to measure read and write speeds.
+  * **How to Use**:
+    - **Write Speed**: Open Terminal and enter:\\ ''time dd if=/dev/zero of=/Volumes/YourDriveName/testfile bs=1024k count=1024''\\ //Replace //''YourDriveName''// with the name of your thumb drive.//
+    - **Read Speed**: After creating the test file, enter:\\ ''time dd if=/Volumes/YourDriveName/testfile of=/dev/null bs=1024k''
+    - **Interpretation**: The time reported at the end shows how long the data transfer took, from which you can calculate the speed.
+  * **Advantages**: Flexible and works without any additional software.
+=== 4. Disk Utility (Indirect) ===
+  * **About**: While Disk Utility on macOS doesn’t directly measure speed, it can help identify if the drive is connected at the correct speed.
+  * **How to Use**:
+    - Open **Disk Utility** and select your thumb drive.
+    - Go to **Info** to see if it’s connected at USB 3.2 speeds or lower.
+  * **Advantages**: Useful for troubleshooting connectivity issues or confirming connection speed, though it won’t directly show transfer rates.
+Using any of these methods will give you a good idea of your thumb drives’ actual read and write speeds. Blackmagic Disk Speed Test is usually the easiest for quick results, while the `dd` method in Terminal is a great way to measure without any added software.