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As I understand, an SD card can be V1 or V2. Within the V2 catagory, there is non-SDHC and SDHC. I have an 1 GB SD card. Is there any software or anything that I can tell if it's V1 or V2?

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Really? I thought SDHC only applied to 4gb for both versions.. you could have 4GB-SD and 4GB-SDHC, then everything above is SDHC and everything below 4GB is standard... Thats why if you want compatibility in SD cards, I always use 2GB or 1GB ones. Just think about, why would you use HighCapicity on 2GB, if it does not exceed the limit? –  ppumkin Jan 23 '12 at 16:42
    
a) 4GB cards are always sdhc. b) the op is asking about some distinction between different kinds of non-sdhc card, which I'm unfamiliar with. Try to draw a Venn diagram if you're still confused. –  Eroen Jan 23 '12 at 19:33
    
I don’t suppose you are referring to speed classes are you? –  Synetech Sep 16 '12 at 14:42
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You must talk directly to the card to decide whether it is "SD 1" or "SD 2.x", either via SD protocol or SPI. Thouse USB->SD card readers hide this detail from you.

But it is of no interest for a user. I've looked through my code from a deeply embedded system - talks to SD/SDHC via SPI - and this bit is not used anywhere. So it contains zero usable information.

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