Quote:
Originally Posted by lonku
I'd like to get a dedicated 64GB card for my kobo aura HD (which would contain android and a partition containing pdfs and cbz files which average around 50MB-200MB, and also contain 1000s of images averaging 100kb-1MB)
I've found threads here mentioning that class 4 cards perform better than class 10 cards, but as far as I'm aware, class 4 64gb cards don't exist? or is it a matter of brand in this case?
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In my rather limited testing, I've found that the SanDisk and Samsung 64GB cards are consistently among the best for small block performance. The problem is that most high capacity cards are optimized for reading/writing large blocks (large files, multimegabyte images, videos, etc.) and their performance on small blocks is pathetic.
If you have a Windows computer, I'd suggest trying CrystalDiskMark to test any card you purchase. Take a close look at the 4K and 4K QD32 results.
The reason for the earlier recommendation was that some Class 10 cards would have incredible large block read/write results but drop to using kilobytes to measure their performance on small block read/write operations.
This originally came up when people were modifying their Nooks and wondered why some cards worked well and others make the Nook almost unusable. It turned out Android on the Nooks was doing a lot of small block read/write operations. When I tested some cards I had on hand, a SanDisk class 4 card gave me a 1.81MB/sec write speed while a Kingston class 10 card gave me a 0.019MB/sec write speed -- and, yes, that was not a typo, it was 19 kilobytes/sec write speed.
Regards,
David