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8 gig P2 card


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#1 Michael LaVoie

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Posted 27 June 2007 - 08:45 PM

So, what's the deal with the 8 gig P2 card. I have 2 and I've noticed that they both only hold about 7.16 gigs. They fill up in the camera and when I load them in a Powerbook it says I'm only copying 7.16 in the contents folder. This is after formating the cards too. Can anyone explain this? Is it the same principle as a harddrive where a 150gig drive is actually only 145 or something because of it's own system.
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#2 Phil Rhodes

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Posted 28 June 2007 - 04:56 AM

Hi,

I haven't done the maths, but I suspect it's just the decimal-gigabytes cheat used by the hard disk manufactuers. Specifically, they tend to assume that there are 1000 kilobytes in a megabyte and/or 1000 megabytes in a gigabyte, as opposed to 1024 as is actually the case due to simple base-two binary arithmetic.

Quite why this is not just "lying" I have no idea but it seems to be accepted pratice.

P2 cards are just four SD cards in a chassis with additional controller electronics, so if they put four 2Gb SD cards together, there's your problem.

Phil
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