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Old Aug 5, 2003, 4:48 PM   #1
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Default Why does my 128mb smartmedia shows up as 124mb in XP

Why does my 128mb smartmedia shows up as 124mb in Win XP ?
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Old Aug 5, 2003, 6:11 PM   #2
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Actually it shouldn't, your card should display a formatted capacity closer to 121.6MB, the advertised capacity minus 5%. I don't know where that 5% goes to, but I think it's time manufacturers sell memory cards stating their formatted capacities. My 1GB actually has 972MB usable space, while my 320MB actually has 305MB. It's a conspiracy I tell ya! :roll:
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Old Aug 5, 2003, 10:20 PM   #3
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My 512MB compact flash card came up as 490. I have no idea why, I just figure it's like the hard drive thing. You know, like computer hard drives are advertised at a certain amount, but you lose a few gigs in the numerical translation, *lol*.
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Old Aug 5, 2003, 11:35 PM   #4
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Quote:
My 1GB actually has 972MB usable space, while my 320MB actually has 305MB. It's a conspiracy I tell ya!
My 1G 32x Lexar now says 982MB with 32kB used after formatting in the camera, but my 1G microdrive still says 1G with 64kB used also after formatting in camera...

I don't know why the 10D says 32kB used in one case and 64kB in the other let alone 982MB vs 1G :?
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Old Aug 9, 2003, 5:20 AM   #5
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I've always believed that card memory size is the actual memory cell capacity, which is always a multiple of 2^n. I.e this is the unformatted physical size - since this is how memory chips are made.

But after formatting - which uses space to hold the tables, sector addresses etc, AND mark out bad blocks, the amout left for file storage will be less and never consistent card to card if bad blocks are high. Small cluster sizes will need bigger FAT tables and large cluster sizes will increase slack space and actual card capacity if there are marked bad blocks which can't be written to. I don't worry about losing a few pics on a large card. VOX
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Old Nov 10, 2003, 8:48 PM   #6
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Default Re: Why does my 128mb smartmedia shows up as 124mb in XP

Quote:
Originally Posted by edgargamboa
Why does my 128mb smartmedia shows up as 124mb in Win XP ?
Its because they use the same numbering system as hard drives. IE

128,000,000 bytes not 134,217,728 bytes

128,000,000 bytes is about 122MB. I would put that at +-3 or so MB depending on the maker of the card.

Eric
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Old Nov 11, 2003, 7:29 AM   #7
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IMO Vox is correct:
Quote:
But after formatting - which uses space to hold the tables, sector addresses etc, AND mark out bad blocks, the amout left for file storage will be less and never consistent card to card if bad blocks are high.
The rest of the memories are held in reserve and not mapped out for the wear-leveling algorithm, ie in case a bad block of flash need to be marked out and replaced with a good one...
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Old Nov 23, 2003, 2:07 PM   #8
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I think ewitte has it right. Dansdata.com had some excellent pieces on this not too long ago and they're still archived.
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