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I just bought a 12 GB Pendrive. When I tested it, It was only 2 GB (Yeah, I just got cheated).

But then I ask: Is it possible to create a 12 GB Pendrive (specially with 1 chip) ?? If noy, why ??

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closed as not a real question by sblair, Tom Wijsman, Dave M, Ƭᴇcʜιᴇ007, Nifle Apr 10 '12 at 11:53

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Where'd you buy this, a friend? –  ekaj Apr 10 '12 at 1:26

2 Answers 2

Sure it is. But it's not practical since it would require three 4GB chips instead of one 8GB or 16GB chip.

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But in only 1 chip, is it posssible ? –  COCACOLA_SAUDE Apr 10 '12 at 1:05
    
I suppose you could have a 16GB chip with only 12GB marked as usable, but there wouldn't be much point. –  Keith Thompson Apr 10 '12 at 1:06
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@COCACOLA_SAUDE: They don't make 12GB chips. –  Ignacio Vazquez-Abrams Apr 10 '12 at 1:09
    
@Ignacio: Those are RAM chips, and the chosen answer for that question references the tie between memory address sizes and the CPU. That's completely irrelevant for storage devices. –  Lèse majesté Apr 10 '12 at 1:19
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@Ignacio: Is that why 12GB microSD cards exist? And if that were the case, how exactly does a 3-bit MLC NAND chip work? –  Lèse majesté Apr 10 '12 at 1:35

They have just adjusted the controller and/or partition to return those values; in some occasnions reformatting gives you the effective limit, in other cases writing past the limit just makes it wrap around from the start again. So, if you would write 3 GB on a 2 GB, you would be overwriting 1 GB of the first 2 GB that you've written.

Long story short:They indeed tampered with it, trust is an important consideration when buying...

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