公布的磁盘空间与实际磁盘空间 [英] Advertised disk space vs actual disk space

问题描述

为什么公布的磁盘空间几乎总是大于UI报告的磁盘空间?例如，我有一个"80 gb"硬盘，但iTunes UI仅指示74.通常在硬盘上以及驱动器号中报告的数量也是如此.

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.

推荐答案

有3个原因导致您实际可以使用的空间数量与驱动器上列出的数量不同，所有可用的 反对你:

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:

1. 硬盘制造商将1GB视为十亿字节，而操作系统将其称为1,073,741,824字节(1000 * 1000 * 1000与1024 * 1024 * 1024).
2. 格式化时会丢失文件表的空间.
3. 磁盘空间被分成大于1个字节(通常为4K)的块.使用典型的Windows默认值，一个1字节的文件会占用磁盘4K的空间.

其中，前两个可以影响驱动器报告的空间量(尽管IIRC，第二个是FAT32而不是NTFS的问题).最后一个仅影响剩余的可用空间，但仍会阻止您使用驱动器的全部容量.

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.

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