AQOTD (Arithmetic Question Of The Day)
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Hi, I would imagine that the manufacturer is using the SI units... so the drive probably has 8,000,000,000 bytes of available space. When you created the filesystem... the metafiles such as the $MFT would consume a small percentage of that... leaving you with less than 8GB. Now can you explain why my old 21 inch 4:3 CRT monitor is missing 1.8 inches? I have never been able to explain that one... :^) Best Wishes, -David Delaune
Randor wrote:
Now can you explain why my old 21 inch 4:3 CRT monitor is missing 1.8 inches?
I stole those.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
[My articles] -
How many bytes are there in a Gigabyte? I baught a few USB flash drives (Kingston) that are supposed to be 8GB. But the total capacity is not even 8,000,000,000 bytes, but 7,794,737,152 bytes.
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Hi, I would imagine that the manufacturer is using the SI units... so the drive probably has 8,000,000,000 bytes of available space. When you created the filesystem... the metafiles such as the $MFT would consume a small percentage of that... leaving you with less than 8GB. Now can you explain why my old 21 inch 4:3 CRT monitor is missing 1.8 inches? I have never been able to explain that one... :^) Best Wishes, -David Delaune
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Formatting the disk requires a certain amount of space on the disk, and the type of format (FAT, FAT32, or NTFS) determines the cluster size, and thus the available free space on the drive. the same thing happens on hard drives. The bigger the drive, the more space you lose to 'overhead".
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997Right. And let's not forget that the smallest space a file can occupy is one cluster, even if the file has only one single byte. The larger the drive, the more physical sectors make up one cluster and the more space is actually wasted if you have many tiny files.
And from the clouds a mighty voice spoke:
"Smile and be happy, for it could come worse!"And I smiled and was happy
And it came worse. -
Hi, I apologize in advance for being argumentative... but that is completely FALSE. It is in-fact completely the opposite and all USB flash drive manufacturers have standardized using SI units for reporting available space. I've been developing embedded applications on these devices for 7 years and before SandDisk even held the patents... the technology was pioneered by a small company called M-Systems and the prototypes were called uDOC. Anyway you are partially correct... the chips themselves are engineered with a number of blocks using powers of 2... but flash drives use these extra blocks for replacing/reallocating old blocks with high error rates. Best Wishes, -David Delaune
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Hi, I apologize in advance for being argumentative... but that is completely FALSE. It is in-fact completely the opposite and all USB flash drive manufacturers have standardized using SI units for reporting available space. I've been developing embedded applications on these devices for 7 years and before SandDisk even held the patents... the technology was pioneered by a small company called M-Systems and the prototypes were called uDOC. Anyway you are partially correct... the chips themselves are engineered with a number of blocks using powers of 2... but flash drives use these extra blocks for replacing/reallocating old blocks with high error rates. Best Wishes, -David Delaune
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Formatting the disk requires a certain amount of space on the disk, and the type of format (FAT, FAT32, or NTFS) determines the cluster size, and thus the available free space on the drive. the same thing happens on hard drives. The bigger the drive, the more space you lose to 'overhead".
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997That's like you are buying a donut which someone already took a bite. The bite was consumed by the baker during its manufacturing process. In other words, "it's overhead".
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Hi, I would imagine that the manufacturer is using the SI units... so the drive probably has 8,000,000,000 bytes of available space. When you created the filesystem... the metafiles such as the $MFT would consume a small percentage of that... leaving you with less than 8GB. Now can you explain why my old 21 inch 4:3 CRT monitor is missing 1.8 inches? I have never been able to explain that one... :^) Best Wishes, -David Delaune
Randor wrote:
Now can you explain why my old 21 inch 4:3 CRT monitor is missing 1.8 inches? I have never been able to explain that one...
If you take it out of the casing before you measure it from corner to corner, not the visible pixels but the physical corners of the CRT, you will find out where the missing 1.8 inches are.
Light moves faster than sound. That is why some people appear bright, until you hear them speak. List of common misconceptions
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How many bytes are there in a Gigabyte? I baught a few USB flash drives (Kingston) that are supposed to be 8GB. But the total capacity is not even 8,000,000,000 bytes, but 7,794,737,152 bytes.
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Randor wrote:
Now can you explain why my old 21 inch 4:3 CRT monitor is missing 1.8 inches? I have never been able to explain that one...
If you take it out of the casing before you measure it from corner to corner, not the visible pixels but the physical corners of the CRT, you will find out where the missing 1.8 inches are.
Light moves faster than sound. That is why some people appear bright, until you hear them speak. List of common misconceptions
Well, I guess I should have known... its always the artists fault... you know... that chain-smoking pothead with the tie-dye tee-shirt back in the rear office spending his entire day inside 3D CAD design software. I'm sure that the curvy/beveled encasement will sell a few thousand more monitors... but I'd rather have the extra inches on the viewscreen. :) Best Wishes, -David Delaune
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Well, I guess I should have known... its always the artists fault... you know... that chain-smoking pothead with the tie-dye tee-shirt back in the rear office spending his entire day inside 3D CAD design software. I'm sure that the curvy/beveled encasement will sell a few thousand more monitors... but I'd rather have the extra inches on the viewscreen. :) Best Wishes, -David Delaune
Personally I'd rather blame marketing.
Light moves faster than sound. That is why some people appear bright, until you hear them speak. List of common misconceptions
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How many bytes are there in a Gigabyte? I baught a few USB flash drives (Kingston) that are supposed to be 8GB. But the total capacity is not even 8,000,000,000 bytes, but 7,794,737,152 bytes.
as per Shameel's answer, but I also note it is usually sales people who think in Raw SI units eg 1KB = 1000 bytes, not 1024 - why, because it's too hard for them to relate/count in base 2.. so to use 'pure SI' as simple 'thousands' for example, is easier on them - more painful on us - I always feel ripped off knowing Im not actually getting what I want 'g'
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Storage uses SI units, therefore 1 KB = 1000 bytes (and not 1024 bytes). So 8 GB = 8000000000 bytes, some of which is used by the file system. How much is used depends on the type of the file system i.e. FAT, FAT32, NTFS, etc.
Here is what it says when I look at the "properties" of the drive before I used any space on it: Used Space: 104,071,168 bytes, 99.2 mb Free Space: 7,690,665,984 bytes, 7.12gb Capacity: 7,797,734,152 bytes, 7.25gb It is the 0.75gb of "hidden" overhead that upsets me, I don't care how it was manufactured and what they have to do, don't tell me I am paying for 8gb when it is actually 7.12gb. That's more than 10% less. The sales tax in my state is about 5% and it is printed clearly on the receipt!
