Linux 在 Win7/Mac OS X/Ubuntu 文件系统上，单个文件夹中可以保存的最大文件数是多少？
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What is the max number of files that can be kept in a single folder, on Win7/Mac OS X/Ubuntu Filesystems?
提问by TCSGrad
I'm wondering about what is the maximum number of files that can be present in a single folder, in the file systems used by all the prevalent OSes mentioned. I need this information in order to decide the lowest common denominator, so that the folder I'm building can be opened and accessed in any OS.
我想知道在提到的所有流行操作系统使用的文件系统中，单个文件夹中可以存在的最大文件数是多少。我需要此信息来确定最小公分母，以便可以在任何操作系统中打开和访问我正在构建的文件夹。
采纳答案by ytg
In Windows (assuming NTFS): 4,294,967,295 files
在 Windows 中（假设 NTFS）：4,294,967,295 个文件
In Linux (assuming ext4): also 4 billion files(but it can be less with some custom inode tables)
在 Linux 中（假设为 ext4）：还有 40 亿个文件（但使用一些自定义 inode 表可能会更少）
In Mac OS X (assuming HFS): 2.1 billion
在 Mac OS X 中（假设 HFS）：21 亿
But I have put around 65000 files into a single directory and I have to say just loading the file list can kill an average PC.
但是我已经把大约 65000 个文件放到了一个目录中，我不得不说仅仅加载文件列表就可以杀死一台普通的 PC。
回答by clrx
From what I know for Windows 7, you can have unlimited amount of files per directory. BUT the more files you have on a volume, the worse the performance will be for that volume.
根据我对 Windows 7 的了解，每个目录可以拥有无限数量的文件。但是一个卷上的文件越多，该卷的性能就越差。
回答by bdonlan
Most modern OSes have no upper limit, or a very high upper limit. However, performance usually begins to degrade when you have something on the order of 10,000 files; it's a good idea to break your directory into multiple subdirectories before this point.
大多数现代操作系统没有上限，或者有一个非常高的上限。但是，当您拥有 10,000 个文件时，性能通常会开始下降；在此之前，最好将您的目录分成多个子目录。
回答by DarkDust
This depends on the filesystem. The lowest common denominator is likely FAT32 which only allows 65,534 files in a directory.
这取决于文件系统。最小的公分母可能是 FAT32，它只允许一个目录中有 65,534 个文件。
These are the numbers I could find:
这些是我能找到的数字：
- FAT16 (old format, can be ignored): 512
- FAT32 (still used a lot, especially on external media): 65,534
- NTFS: 4,294,967,295
- ext2/ext3 (Linux): Depends on configuration at format time, up to 4,294,967,295
- HFS+ (Mac): "up to 2.1 billion"
- FAT16（旧格式，可以忽略）：512
- FAT32（仍然使用很多，尤其是在外部媒体上）：65,534
- NTFS：4,294,967,295
- ext2/ext3 (Linux)：取决于格式化时的配置，最多 4,294,967,295
- HFS+ (Mac)：“高达 21 亿”
