Memory Cards Test - my 7...

Paul Iddon

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So today - I ran 7 MicroSD memory cards through Crystal Disk 7.0 to measure their read/write speeds. Each card was blank and has been formatted - and the USB card reader is the G4 Mobile Lite USB3 card reader through a USB3 port. The seven images below show the results. These cards get used in a variety of dashcams running 4K, 1440p, and 1080p. Obviously, the higher spec dashcams carry the faster cards when in the car and in use. These are the only cards I have - I haven't got any High Endurance or High Endurance Pro memory cards. Manufacturers claims - the Delkin would be the fastest I suspect but in my test it wasn't quite there - however for maximum speeds I would need a USB3.1 port and card reader (designated USB 3.1 Rev 2,” “USB 3.1 Gen 2) which would take advantage of their UHS-II architecture (they have 2 rows of contacts which theoretically would allow up to 250MB/s write speed). One day, I'll put one of these ports into my computer!

I hope this helps in some way for you all - and fair to say - every card I have works, though the slowest I only ever used in 1080p cams.
The price of these cards go from about £7 for the slower smaller capacity cards - up to around £150+ (and I have 2 of these buggers!!!) for the most expensive card, the Delkin Power.

I make no recommendations for which you should use - the manufacturers may or may not cover their cards for using in dashcams to due the constant writing.

I have added them from best write speed through the worst.

Paul.

1st_Samsung_Evo_Plus_128GB.jpg

2nd_Sandisk_Extreme_Plus_64GB.jpg

3rd_Delkin_Power_64GB.jpg

4th_Nextbase_64GB.jpg

5th_MyMemory_128GB.jpg

6th_Samsung_Evo_Plus_32GB.jpg

7th_Sandisk_Ultra_64GB.jpg
 
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DT MI

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More than my wife thinks I need.
Do you have a dedicated SD slot on your computer? In the past I've done the same testing and found that even a USB3 adapter will test a bit slower (about 2% or so) than the same card being tested in a dedicated slot.
 
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Paul Iddon

Paul Iddon

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I do have a slot, but it doesn't work. The ports are set up this y by the builder of the PC.

Paul.
 

SawMaster

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I'm looking at the two Samsung EVO's, and wondering why one writes at 89.97 and the other writes at 35.45? The only difference is card size, so does the file system (fat32 versus EXFAT) play that large a role here? It just doesn't make sense to me :(

Phil
 

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Gitup F1+G3ꞈꞈꞈꞈꞈ Viofo A139ꞈꞈꞈꞈꞈ Blueskysea B4K+B2K
I'm looking at the two Samsung EVO's, and wondering why one writes at 89.97 and the other writes at 35.45? The only difference is card size, so does the file system (fat32 versus EXFAT) play that large a role here? It just doesn't make sense to me :(

Phil
The 128GB card is quite likely made up of four 32GB memory blocks that can write simultaneously giving 4x the size and nearly 4x the speed. However that only works when you have sequential data to write, which is why on the random write test the smaller card is actually faster! We don't need the very high sequential write speeds for dashcams, the random write speed at the bottom of the write column is probably the most important figure for comparisons.

"(fat32 versus EXFAT)" - most of our cameras still won't use exFAT, so it doesn't make much difference. exFAT only does better than FAT once you have a large number of files on the card, which can happen when there are lots of small parking mode files. Dashcams should be using exFAT, it was designed for flash memory and should give longer life then FAT which was designed for rotating mechanical disks.

Does that U number change the speeds that much?
The U number is the version of the communications hardware+protocol between card and reader, U3 is faster than U1 which is faster than the original with no U number at all, but I don't think any dashcams are actually using the UHS bus yet, so it doesn't make any difference until you put the card into a USB3 UHS1/3 card reader and plug it into your computer.

The A number, as in "A1", is of interest since it guarantees a minimum performance. The A2 gives even better performance but again the dashcams don't have any hardware/firmware to support A2 so it doesn't help. An "A" number of 1 or greater is good to have, but many cards without it will still do fine.
 
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Paul Iddon

Paul Iddon

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My Delkin USH-II (has 2 rows of pins) offer no advantage in dashcams (atm).

I have now put into my PC a USB3.1 port, and with my USB3.1 card reader, it performs much faster. The card is meant to be capable of up to 300MB/s read and up to 250MB/s write speeds.

This is what I got tonight:
 

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