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Old 10-20-2013, 12:23 PM
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kp-j3 kp-j3 is offline
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Default SD card performance/recommendations

I use SD cards in my car stereo, and one of my SD cards is extremely slow. Using a benchmarking tool http://www.attotech.com/disk-benchmark/ I found that it's maxing out at 15MBs write, and 20MBs read. All of the other ones I've tested are hovering around 80/90. The strange thing is I have 2 Transcend SDXC 64GB class 10s that are supposedly identical, and one's the dud, and another blazes almost as good as a sandisk.

Anyone have any recommendations on achieving higher speeds without randomly buying cards and hoping for the best?

I see this one:
http://www.amazon.com/Digital-Speed-...=sd+card+64+gb

But I'm certainly not paying $600 for a 64GB card. (claimed 400MBs/1200x)

Even this one is $225:
http://www.amazon.com/Sandisk-Extrem...=sd+card+64+gb

but I'm already achieving neer that speed with every other card I've bought for ~$1 per GB, except for the one outlier.

Good cards take ~16 seconds to scan the file system and rebuild the database, the crappy one takes 34 seconds, and the system boot time is an additional 11 seconds.
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Daily drivers - Cowon J3 32GB/64GB microSD, Sennheiser hd202s
Others - Cowon D2+ 8GB, Iaudio 7 8 & 16GB, Sandisk m260, Samsung yp-r0 8GB, SGP 5.0
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