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Add notes about the performance of Sandisk Ultra cards

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Nicholas Sherlock 2015-03-06 23:44:05 +13:00
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docs/Blackbox.md
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@ -79,11 +79,13 @@ not a guarantee of better performance.
- Generic 4GB Class 4 microSDHC card - the rate of missing frames is about 1%, and is concentrated around the most
interesting parts of the log!
- Sandisk Ultra 32GB (unlike the smaller 16GB version, this version has poor write latency)
##### microSDHC cards known to have good performance
- Transcend 16GB Class 10 UHS-I microSDHC (typical error rate < 0.1%)
- Sandisk Extreme 16GB Class 10 UHS-I microSDHC (typical error rate < 0.1%)
- Sandisk Ultra 16GB (it performs only half as well as the Extreme in theory, but still very good)
You should format any card you use with the [SD Association's special formatting tool][] , as it will give the OpenLog
the best chance of writing at high speed. You must format it with either FAT, or with FAT32 (recommended).