Quote:
Originally Posted by DNSB
Swapping in a class 10 card can be iffy. The larger class 10 cards tend to be optimized for large block read/write speeds while the Kobo ereaders are happier with faster small block read/write speeds. There was quite a bit of discussion about this issue a while back with the conclusion being the most reliable manufacturers for small block speed were SanDisk and Samsung.
Oddly, when I was playing with changing out the internal cards, internet browsing speed was not that noticeably affected. For the most part, an eInk screen is not the best for internet browsing due the slow refresh rate.
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Class rating for SD cards is based on minimum sequential write performance.
Class 2: 2MB/s
Class 4: 4MB/s
Class 10: 10MB/s
There's no requirement for small block performance.
Size or class isn't really the issue. Apart from SanDisk and Samsung, most other SD cards I've used had abysmal small block write regardless if they're Class 2 or 10. Even if you had a Kingston 4GB Class 4, it's likely still going to perform quite poorly (that's what I first used on my Nook Color and it constantly crashed).
Best stick to
genuine Samsung or SanDisk cards. Plenty of fakes on ebay and even Amazon Marketplace sellers so caveat emptor.