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Old 08-10-2005, 20:32   #1
LiviLion
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Angry Not enough space on disk!!!!!

Grrrrrrrrr,

I grew up in the days when 1KB wasn't 1000 bytes but was 1024 bytes.

Trying to burn some mpegs onto a blank dvd and thought I'll just get this onto a 4.7GB DVD.

No though much to my surpise:

Data to be written 4,552MB (4,777,904,384 bytes)
Space available on disk 4482MB (4,700,372,992 bytes)

So really my 4.7GB dvd isn't really 4.7GB it's 4.38GB.

If you ask me 4.7GB is 5,046,586,572 bytes.

LL
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Old 08-10-2005, 20:39   #2
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Quote:
Originally Posted by LiviLion

Data to be written 4,552MB (4,777,904,384 bytes)
Space available on disk 4482MB (4,700,372,992 bytes)


asked and answered

It's the old 1024 bytes = 1mb marketing malarky.

Last edited by raymondlin; 08-10-2005 at 20:40.
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Old 08-10-2005, 20:54   #3
LiviLion
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Quote:
Originally Posted by raymondlin
asked and answered

It's the old 1000 bytes = 1mb marketing malarky.
is what I think you mean as if it was 1024bytes I'd be laughing.

LL
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Old 08-10-2005, 20:55   #4
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No so much marketing as kilo-, mega-, giga- and the like being SI prefixes which are for conventional base-10 numbers. A megabyte (by SI definition) is 1,000,000 bytes.

However, the numbers Windows (and lots of other systems use) are binary but use the SI prefixes instead of binary prefixes like kibi-, mebi-, gibi- which would be correct.

Unfortunately as the incorrect prefix gives the impression of being bigger, the confusion remains.
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Old 08-10-2005, 21:05   #5
LiviLion
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Hmmm,

Got me thinking now.

In the good old days, lets go back say 10 years when disk drives around 200MB were 200 quid :-)

Was a megabyte 1024 kilobytes (1048576 bytes) or 1000 kilobytes (1000000 bytes).

I'm certain it was 1024 but the previous posters put a shred of doubt in my mind.

I'm positive in the last 5 years or so manufacturers have slowly changed the value of kilo/mega/giga to be 1000 and not 1024 which is technically correct using SI values but not going back to what I would regard as commonly accepted values.

Last edited by LiviLion; 08-10-2005 at 21:06.
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Old 08-10-2005, 23:30   #6
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Quote:
Originally Posted by LiviLion
Hmmm,

Got me thinking now.

In the good old days, lets go back say 10 years when disk drives around 200MB were 200 quid :-)

Was a megabyte 1024 kilobytes (1048576 bytes) or 1000 kilobytes (1000000 bytes).

I'm certain it was 1024 but the previous posters put a shred of doubt in my mind.

I'm positive in the last 5 years or so manufacturers have slowly changed the value of kilo/mega/giga to be 1000 and not 1024 which is technically correct using SI values but not going back to what I would regard as commonly accepted values.
If I say

byte =! bit

that might get you back on track
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