I have 2 more questions:
1) What about buying a SanDisk Class 4 Micro SDHC together with an adapter, like this one:
http://www.amazon.it/SanDisk-micro-S...9408175&sr=8-2
Does it fit inside a Kobo Glo?
2) [OT] Can I later use a uSD Class 4 on a smartphone (e.g. a Samsung Galaxy S*)?
I read that SanDisk Class 10 uSDs don't work properly on those phone.