blocks|key|5354650|text|您实际可以使用的空间量与驱动器列出的空间量不同的原因有3个，所有这些原因都对您不利：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5354651|5354652|硬盘制造商将1+1GB视为10亿字节，而操作系统将其称为1,073,741,824字节(1000+*+1000+*+1000+vs+1024+*+1024+*1024)。当formatting.|ordered-list-item|5354653|Disk空间被划分为大于1字节的区块(通常为4K)时，|5354654|会丢失一些文件表空间。使用典型的Windows默认值，一个1字节的文件会占用4K的磁盘空间。|5354655|5354656|其中，前两个会影响驱动器报告的空间量(尽管IIRC第二个更多的是FAT32的问题，而不是NTFS)。最后一个选项只会影响剩余可用空间的大小，但仍然会阻止您使用驱动器的全部容量。|5354657|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|S|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

There are 3 reasons why the amount of space you can actually use is different from that listed for the drive, all of which work against you:

<ol>
<li>Hard drive manufacturers treat 1GB as one billion bytes, while the operating system calls it 1,073,741,824 bytes (1000 * 1000 * 1000 vs 1024 * 1024 * 1024).</li>
<li>You lose some space for file tables when formatting.</li>
<li>Disk space is divided into chunks larger than 1 byte (typically 4K). Using typical Windows defaults, a 1 byte file takes up 4K of space on disk.</li>
</ol>

Of these, the first two can influence the amount of space reported by the drive (though IIRC the 2nd one was more of an issue with FAT32 than NTFS). The last one only influences the amount of free space remaining, but will still prevent you from using the full capacity of your drive.

blocks|key|3098782|text|这是操作系统与硬盘制造商计算可用空间的方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3098783|操作系统:+1mb+=1024KB|3098784|供应商:+1mb+=+1000+kb|3098785|供应商将始终使用*1000来增加其数量。|3098786|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

It's the way the OS calculates free space vs the hard drive manufacturers.

OS: 1mb = 1024 kb

Vendor: 1mb = 1000 kb

The vendor will always use the *1000 to increase their numbers.

blocks|key|806485|text|罪魁祸首是使用基数10与基数2来列出存储大小。它实际上变成了一个舍入误差。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|806486|有一个movement可以尝试使用基数2而不是基数10来列出存储大小，以反映真实大小。|offset|length|806487|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Mebibyte^0|0|3|8|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

The main culprit is using base 10 vs. base 2 to list the storage size. It effectively becomes a rounding error.

There is a <a href="http://en.wikipedia.org/wiki/Mebibyte" rel="nofollow noreferrer">movement</a> to try and list storage size with base 2 values instead of base 10 to reflect the true size.

blocks|key|5354699|text|这就是1000的倍数的standard+(SI)+prefixes+(giga,+mega,+kilo,+etc.)和1024的倍数的binary+prefixes之间的区别。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5354700|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Si_prefixes|1|http://en.wikipedia.org/wiki/Binary_prefix^0|B|1B|0|1V|F|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

It's the difference between the <a href="http://en.wikipedia.org/wiki/Si_prefixes" rel="nofollow noreferrer">standard (SI) prefixes (giga, mega, kilo, etc.)</a> which are multiples of 1000 and the <a href="http://en.wikipedia.org/wiki/Binary_prefix" rel="nofollow noreferrer">binary prefixes</a> which are multiples of 1024.

blocks|key|3098812|text|市场营销认为80+be相当于80,000,000,000字节。OS将80+be视为85,899,345,920字节。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3098813|http://www.google.com/search?q=80000000000%2Bbytes%2Bin%2BGB|offset|length|3098814|entityMap|0|LINK|mutability|MUTABLE|url|http://www.google.com/search?q=80000000000%2Bbytes%2Bin%2BGB^0|0|0|1I|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Marketing considers 80 gigabytes to be 80,000,000,000 bytes. The OS considers 80 gigabytes to be 85,899,345,920 bytes.

<a href="http://www.google.com/search?q=80000000000+bytes+in+GB" rel="nofollow noreferrer">http://www.google.com/search?q=80000000000+bytes+in+GB</a>

blocks|key|3944666|text|通常是由于操作系统或某些软件出于备份或系统目的而占用和隐藏的一些分区空间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3944667|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|$]]

Usually due to some partitioned space that the OS or some software takes and hides for backup or system purposes.

blocks|key|5354522|text|例如，制造商认为一个MB为1024KB；其他为1000KB。GB也是如此。有人说是1024MB，也有人说是1000MB。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5354523|然后，这指的是未格式化的大小。格式化会占用一些空间。|5354524|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|$]]

Say manufacturer consider a MB to be 1024KB; others 1000KB. Similarly for GB. Some say 1024MB; others 1000MB. 

Then, that refers to the un-formatted size. Formatting takes up some space.

blocks|key|3944729|text|此外，他们还多次宣传千兆字节的数据略有不准确，这导致了差异。你可以在大多数硬盘盒外面的免责声明文本中看到这一点！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3944730|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|$]]

Additionally many times they advertise gigabytes as slightly inaccurate numbers, which result in differences. You can see this in the disclaimer text on the outside of most hard drive boxes!

Why is it that advertised disk space is almost always higher than the disk space reported by the UI? For example, I have an "80 gb" hard drive, but the iTunes UI indicates only 74. I usually see this as well with hard disks and the amount reported with the drive letter.

Advertised disk space vs actual disk space

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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为什么通告的磁盘空间几乎总是高于UI报告的磁盘空间？例如，我有一个"80 gb“的硬盘，但iTunes UI显示只有74。我通常也会在硬盘上看到这一点，以及驱动器盘符报告的数量。

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