ntfs | 易学教程

How do you deal with lots of small files?

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问题 A product that I am working on collects several thousand readings a day and stores them as 64k binary files on a NTFS partition (Windows XP). After a year in production there is over 300000 files in a single directory and the number keeps growing. This has made accessing the parent/ancestor directories from windows explorer very time consuming. I have tried turning off the indexing service but that made no difference. I have also contemplated moving the file content into a database/zip files

There is in Windows file systems a pre computed hash for each file?

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问题 I want to search a file duplicate by its hash. For performance purposes I want to know if there is a stored hash/checksum for each file in NTFS/FAT file systems. If there is, I don't have to compute them all to search my file. If there is, how to access it using .NET? If it helps, it will be JPEG files. Do they have a checksum? 回答1: There is no such thing. 回答2: Windows does not store a hash for each file. As Jader Dias suggests, there are checksums for EXE's and DLL's but these are not the

Taking ownership of files with 'broken' permissions

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问题 I'm trying to overcome the following situation. Given a directory stored on an NTFS volume, where: The directory owner is set to someone else (a non-privileged user for example) The directory DACL is configured to permit access to a specific group of people that does not include the system or Administrators The DACL on the directory actually grants no one access to either take ownership or change the DACL (or in short, the all administrators have been locked out of the folder) But! The

Mac OS 上的一些骚操作

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本帖记录个人在使用 Mac 操作系统上的一些骚操作，不断更新，以飨读者。快速移动网页到顶部或底部用双指上下划触摸板吗？NO，我们有更骚的操作： command + ↑ 回到顶部 command + ↓ 滚到底部另外， fn + ↑ 上滚一页 fn + ↓ 下滚一页 fn + ← Home，回到顶部 fn + → End，滚到底部粘贴文字时不要带样式有时候从网上看到不错的文字想要粘贴到 Word、Evernote 或者文字编辑应用上，但使用 command + v 会连文字样式都带过来，这时候就要使用骚一点的操作了，那就是： command + shift + v 输入英文时首字母不要自动大写当你在文字编辑软件上写英文时，Mac 会很贴心地识别首字母并自动大写。但常常让我觉得画蛇添足，明明我不想大写，特别是在博客中或写或改一些代码或脚本时更觉得是捣乱。这时候，我找到了一个禁止自动首字母自动大写的方法：系统偏好设置 —> 键盘 —> 文本 —> 去除勾选【自动大写字词的首字母】我要剪切或移动文件 Mac 中，复制的快捷键是 command + c ，粘贴的快捷键是 command + v ，但是剪切的快捷键可不是 command + x ，如果要移动文件，你是不是还在进行粘贴完再删除的复杂操作？ NO，其实移动文件可以复制后使用快捷键 command +

文件或目录损坏且无法读取的解决办法

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方法很简单,用chsdsk命令即可详解如下: 开始--运行--输入cmd--输入chkdsk 盘符: /f ，例如：“chkdsk d: /f”。等命令运行完即可。这里要注意的是,那个冒号后面要空一格,别跟着就写"/f" 故障现象不管是移动硬盘还是U盘，包括本地电脑上的硬盘分区，双击打开时，提示：“无法打开H盘，文件或目录损坏且无法读取，....”。有的分区格式变为RAW。数据丢失原因分析出现这种错误提示，是由于各种原因导致的磁盘文件目录(FAT,MFT)出错造成。主要发生在优盘、MP3、移动硬盘等移动设备上，其中大容量(160G以上)NTFS分区格式的外置移动硬盘发生几率最高最多。产生的原因很多，一般有下面几种原因： 1、没有正常插拔移动设备，系统没有完成完整的读写操作，致使文件目录信息错乱和不完整。比如我们复制一个文件到移动设备，关机重启、拔取后，再次打开使用或到别的电脑上使用时出现症状。 2、选用了劣质产品，包括劣质电源、主板、数据线、特别是劣质外置硬盘盒。产品的电源、主控电路不稳定，致使磁盘寻址出错，写信息错乱。 3、使用了PQ、PM等磁盘分区调整工具。 4、病毒、硬盘硬件本身故障、工作期间突然停电。恢复效果质量如果是大移动硬盘并且是NTFS分区格式的，恢复质量十分理想，基本都能成功恢复文件和目录结构。如果是FAT或FAT32格式，根据损坏程度不同

NTFS alternate data streams

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问题 Today I have seen this weird magic NTFS system supports: each file can have multiple data streams. Basically one could have a file a.txt of 0b size but there can be any number of bytes hidden in a separate data stream for that file. This is strictly NTFS related magic and I don't see any noble reason for having these streams around. You can look for NTFS streams with the help of the streams utility from Sysinternals. This will show you that basically every one of those nasty thumbs.db files

Enable native NTFS symbolic links for Cygwin

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Recent NTFS and Windows implement symlinks: NTFS junction point can be used as directory symlink since NTFS 3.0 (Windows 2000) using linkd or junction tools. NTFS symbolic link can also be used as symlink (for both file and directory) since Windows Vista using mklink tool. But on Cygwin 1.7 (installed on Windows 7), ln -s creates a text file. on Cygwin: $ ln -s -v target mylink `mylink' -> `target' on MinGW (or your favorite editor): $ cat mylink !<symlink>ÿþt a r g e t Is it possible to tell Cygwing to use NTFS junction point or NTFS symbolic link ? other question: Is this available on MinGW?

How do the UNIX commands mv and rm work with open files?

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问题 If I am reading a file stored on an NTFS filesystem, and I try to move/rename that file while it is still being read, I am prevented from doing so. If I try this on a UNIX filesystem such as EXT3, it succeeds, and the process doing the reading is unaffected. I can even rm the file and reading processes are unaffected. How does this work? Could somebody explain to me why this behaviour is supported under UNIX filesystems but not NTFS? I have a vague feeling it has to do with hard links and

What is the difference between NTFS Junction Points and Symbolic Links?

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问题 At a high level, the only obvious difference between NTFS Junction Points and Symbolic Links is that Junctions are only able to be directories, while SymLinks are allowed to also target files. What other differences between the two exist? (Note, I've already seen this question and what I'm looking for is a bit different -- that question is looking for a pro and con list, I'm looking for a set of technical differences) 回答1: Symbolic links have more functionality, while junctions almost seem to

How can I detect only deleted, changed, and created files on a volume?

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I need to know if there is an easy way of detecting only the files that were deleted, modified or created on an NTFS volume. I have written a program for offsite backup in C++. After the first backup, I check the archive bit of each file to see if there was any change made, and back up only the files that were changed. Also, it backs up from the VSS snapshot in order to prevent file locks. This seems to work fine on most file systems, but for some with lots of files and directories, this process takes too long and often the backup takes more than a day to finish backing up. I tried using the

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