blocks|key|3058321|text|有一个区分术语的IEC+standard，例如Mebibyte+=+1024%5E2字节但Megabyte+=+1000%5E2+(为了与千克这样的SI单位兼容，其中k/M/...表示1000/1000000)。实际上，IT领域的大多数人更喜欢兆字节=+1024%5E2，而硬盘制造商更喜欢兆字节=+1000%5E2+(因为硬盘大小听起来比实际大)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3058322|事实上，大多数人对IEC标准(乘数1000)和传统意义(乘数1024)感到困惑。一般来说，你不应该对人们的意思做出假设。例如，MP3s的128kbit/s通常意味着128000比特，因为乘法器1000主要与单位比特一起使用。但通常人们会把2048kbit/s称为2Mbit/s--这很让人困惑，是吧？|3058323|因此，作为一般规则，根本不信任位/字节单位;)|3058324|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Mebibyte^0|8|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

There's an <a href="http://en.wikipedia.org/wiki/Mebibyte" rel="noreferrer">IEC standard</a> that distinguishes the terms, e.g. Mebibyte = 1024^2 bytes but Megabyte = 1000^2 (in order to be compatible to SI units like kilograms where k/M/... means 1000/1000000). Actually most people in the IT area will prefer Megabyte = 1024^2 and hard disk manufacturers will prefer Megabyte = 1000^2 (because hard disk sizes will sound bigger than they are).

As a matter of fact, most people are confused by the IEC standard (multiplier 1000) and the traditional meaning (multiplier 1024). In general you shouldn't make assumptions on what people mean. For example, 128 kBit/s for MP3s usually means 128000 bits because the multiplier 1000 is mostly used with the unit bits. But often people then call 2048 kBit/s equal to 2 MBit/s - confusing eh?

So as a general rule, don't trust bit/byte units at all ;)

blocks|key|314564|text|以下是标准(SI)所说的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314565|http://physics.nist.gov/Pubs/SP330/sp330.pdf#page=34|offset|length|314566|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

Here is what the standard (SI) says:

<a href="http://physics.nist.gov/Pubs/SP330/sp330.pdf#page=34" rel="nofollow noreferrer">http://physics.nist.gov/Pubs/SP330/sp330.pdf#page=34</a>

blocks|key|3058379|text|兆字节意味着2%5E20字节。我知道从技术上讲，这与SI单位不相符，有些人提出了一个新的术语来表示2%5E20，但这些都不重要。试图改变语言来“澄清”事物的努力注定要失败。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3058380|硬盘制造商使用它来表示1,000,000字节，因为这就是SI中的意思，所以他们认为从技术上讲，他们没有说谎(虽然实际上是)。属于谎言、该死的谎言和市场营销。|3058381|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Megabyte means 2^20 bytes. I know that technically that doesn't mesh with the SI units, and that some folks have come up with a new terminology to mean 2^20. None of that matters. Efforts to change the language to "clarify" things are doomed to failure.

Hard-drive manufacturers use it to mean 1,000,000 bytes, because that's what it means in SI so they figure technically they aren't lying (while actually they are). That falls under lies, damn lies, and marketing.

blocks|key|314611|text|使用您的用户最可能期望的计算。您的用户是否关心磁盘或内存中的实际字节数，或者他们只关心可用空间？这个问题的答案将告诉你哪个计算是最有意义的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314612|与其说这是一个精确度问题，不如说它是一个可用性问题。提供对用户最有用的计算。|314613|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Use the computation your users will most likely expect. Do your users care to know how many actual bytes are on a disk or in memory or whatever, or do they only care about usable space? The answer to that question will tell you which calculation makes the most sense.

This isn't a precision question as much as it is a usability question. Provide the calculation that is most useful to your users.

blocks|key|317660|text|答案是，根据Mega前缀的真正含义，#1在技术上是正确的，然而(而且在生活中总是有一个)数学在基数2中不是那么好，这是计算机如何计算的，所以#2是人们真正使用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317661|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The answer is that #1 is technically correct based on the real meaning of the Mega prefix, however (and in life there is always a however) the math for that doesn't come out so nice in base 2, which is how computers count, so #2 is what people really use.

blocks|key|3271762|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3271763|+BTW:在这个问题上，硬盘制造商不算权威！|blockquote|3271764|3271765|3271766|哦，是的，他们是这样做的(而且他们从S.I.中得到的定义是正确的)。有关相关问题，请参阅CodingHorror上的this+post。|offset|length|3271767|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/International_System_of_Units|1|http://www.codinghorror.com/blog/2007/09/gigabyte-decimal-vs-binary.html^0|0|0|0|0|I|4|0|1M|9|1|0^^$0|@$1|2|3|-4|4|5|6|T|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|U|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|V|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|W|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|X|7|@]|8|@$H|Y|I|Z|1|10]|$H|11|I|12|1|13]]|9|$]]|$1|J|3|-4|4|5|6|14|7|@]|8|@]|9|$]]]|K|$L|$4|M|N|O|9|$P|Q]]|R|$4|M|N|O|9|$P|S]]]]

<blockquote>
 BTW: Hard drive manufacturers don't count as authorities on this one!
</blockquote>

Oh, yes they do (and the definition they assume from the <a href="http://en.wikipedia.org/wiki/International_System_of_Units" rel="noreferrer">S.I.</a> is the correct one). On a related issue, see <a href="http://www.codinghorror.com/blog/2007/09/gigabyte-decimal-vs-binary.html" rel="noreferrer">this post</a> on CodingHorror.

blocks|key|3271776|text|除以2的20幂，(1024*1024)字节=+1+to|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3271777|1024*1024+=+1,048,576+++
2%5E20+=+1,048,576
1,048,576/1,048,576+=+1++|code-block|syntax|javascript|3271778|这是一回事。|3271779|entityMap^0|2|1|4|2|8|B|N|1|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

Divide by <code>2</code> to the power of <code>20</code>, <code>(1024*1024)</code> bytes = <code>1</code> megabyte 

<pre><code>1024*1024 = 1,048,576 
2^20 = 1,048,576
1,048,576/1,048,576 = 1 
</code></pre>

It is the same thing.

blocks|key|3058540|text|一般来说，在提到二进制数据大小时使用十进制SI前缀(例如，千、兆)是错误的(临时使用除外)。它是模棱两可的，并且会引起混乱。准确地说，您可以使用binary+prefixes+(例如，1兆字节=1+MiB+=1024千比字节=+2%5E20字节)。当别人对二进制数据使用十进制SI前缀时，您需要获得更多信息，然后才能知道这是什么意思。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3058541|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Binary_prefix^0|20|F|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

In general, it's wrong to use decimal SI prefixes (e.g. kilo, mega) when referring to binary data sizes (except in casual usage). It's ambiguous and causes confusion. To be precise you can use <a href="https://en.wikipedia.org/wiki/Binary_prefix" rel="nofollow noreferrer">binary prefixes</a> (e.g. 1 mebibyte = 1 MiB = 1024 kibibytes = 2^20 bytes). When someone else uses decimal SI prefixes for binary data you need to get more information before you can know what is meant.

I've seen three ways of doing conversion from bytes to megabytes:

<ol>
<li>megabytes=bytes/1000000</li>
<li>megabytes=bytes/1024/1024</li>
<li>megabytes=bytes/1024/1000</li>
</ol>

Ok, I think #3 is totally wrong but I have seen it. I think #2 is right, but I am looking for some respected authority (like W3C, ISO, NIST, etc) to clarify which megabyte is a true megabyte. Can anyone cite a source that explicitly explains how this calculation is done?

Bonus question: if #2 is a megabyte what are #1 and #3 called?

BTW: Hard drive manufacturers don't count as authorities on this one!

Converting bytes to megabytes

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我已经看到了三种将字节转换为兆字节的方法：megabytes=bytes/1000000megabytes=bytes/1024/1024megabytes=bytes/1024/1000好吧，我认为#3是完全错误的，但我已经看过了。我认为#2是正确的，但我正在寻找一些受人尊敬的权威(如W3C，ISO，NIST等)来澄...

问将字节转换为兆字节
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