SG9663DR update


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Mar 12, 2013
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For several years now I've been running both a standard front facing dash cam along with a telephoto dash cam. Usually the telephoto works in concert with my normal dash cam as an "enhanced" auxiliary cam but on occasion one camera really captures what happens when the other one doesn't quite do the job. It's as if to some extent each camera works as a redundant back-up for the other. Since installing the telephoto, I've become rather addicted to having two cameras working together and such a set-up might have helped your situation.
something i have always wanted to get configured but never got around to it, been several times i have wanted it as i couldnt quite see something i wanted to see.


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Apr 10, 2015
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United States
Dash Cam
G1W-S, G1W-HC, G1W clone, B1W, N2 Pro, K2S, B2W, (ex Mobius)
Me too. I wanted to do this but in my hasty moving-of-house I misplaced my telephoto lens and I haven't found it yet- it's somewhere deep in the boxes I stored off-site :cry: There have been a couple incidents where I'm living now which I captured, but without the needed detail to make a positive ID which the telephoto would have done an excellent job with. Nothing serious but the unfilled void has become obvious and of course it would help on the road too ;)



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Oct 10, 2014
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Dash Cam
More than my wife thinks I need.
Do you think that the problem is with the fact that you're using a Samsung EVO Select made by Samsung for Amazon, as opposed to using an EVO Plus original - tests show that the Samsung made for Amazon Select green version is both quicker and more expensive.

Or do you think the problem lies with using the larger capacity of 512 GB vs only 256 GB?
Posting another answer to your question to provide some closure.

After much testing I determined that the card in question was performing well below spec. While it's rated at 90 MB/s write speed in actual use it was only achieving 1.8 MB/s. Little doubt in my mind that's the cause of the problem. See test results below.

I have started the warranty exchange process with Amazon.


Samsung 512GB Test 1

CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World :
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 85.084 MB/s
Sequential Write : 1.862 MB/s
Random Read 512KB : 76.900 MB/s
Random Write 512KB : 1.864 MB/s
Random Read 4KB (QD=1) : 10.394 MB/s [ 2537.6 IOPS]
Random Write 4KB (QD=1) : 0.961 MB/s [ 234.6 IOPS]
Random Read 4KB (QD=32) : 10.901 MB/s [ 2661.4 IOPS]
Random Write 4KB (QD=32) : 1.011 MB/s [ 246.9 IOPS


Samsung 512GB Test 2

Sequential Read : 87.236 MB/s
Sequential Write : 1.870 MB/s
Random Read 512KB : 78.045 MB/s
Random Write 512KB : 1.856 MB/s
Random Read 4KB (QD=1) : 10.208 MB/s [ 2492.1 IOPS]
Random Write 4KB (QD=1) : 0.955 MB/s [ 233.0 IOPS]
Random Read 4KB (QD=32) : 11.012 MB/s [ 2688.4 IOPS]
Random Write 4KB (QD=32) : 0.960 MB/s [ 234.4 IOPS]


Transcend-1 64GB

Sequential Read : 85.724 MB/s
Sequential Write : 23.152 MB/s
Random Read 512KB : 75.010 MB/s
Random Write 512KB : 17.139 MB/s
Random Read 4KB (QD=1) : 3.759 MB/s [ 917.7 IOPS]
Random Write 4KB (QD=1) : 1.103 MB/s [ 269.2 IOPS]
Random Read 4KB (QD=32) : 5.105 MB/s [ 1246.4 IOPS]
Random Write 4KB (QD=32) : 1.164 MB/s [ 284.2 IOPS]
Last edited:

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