神奇的fsutil命令!快速伪装移动硬盘和U盘空间已满
有时出于某些需要,我们要为磁盘的可用空间做一些限制。比如一些移动硬盘或闪存盘等移动存储设备,为了避免其他人写入文件带来病毒,希望对设备的部分可用空间进行“伪装”,使得看上去可用存储空间不足,但是自己需要使用时又可以方便地调整出可用空间。对于类似的存储空间管理,可以借助fsutil命令创建“稀疏文件”(Sparse File)来实现。
一、了解稀疏文件
稀疏文件是应用程序生成的一种特殊文件,这类文件尺寸可以非常大,主要由“00”构成的,实际占用很少的磁盘空间,但是会向系统声明其所需要的总空间。稀疏文件可以通过系统自带的fsutil命令创建。例如,以管理员身份启动命令提示符,输入命令“fsutil file createnew d:\system 157286400”,回车执行后即可在D盘(分区需采用NTFS格式)中创建一个名为system的文件。输入并执行命令“dir d:”可以看到其大小为150MB。
命令解释:
“157286400”表示创建大小为157286400字节(即150MB的文件,1MB=1048576B)的文件,如果要创建其他大小的文件,请自行换算。
继续输入并执行下列的命令(命令尾部的冒号及其后面的内容为注释,实际操作时不用输入):
fsutil sparse setflag d:\system :可以将该文件转换为稀疏文件
fsutil sparse queryflag d:\system :查看文件是否为稀疏文件
fsutil sparse setrange d:\system 0 157286400 :将文件稀疏范围设置为0~157286400字节,即将150MB空间全部设置为稀疏空间。
现在打开D盘,右击system并选择“属性”,在属性窗口中可以看到该文件的大小为150MB,但是占用的空间却显示为0字节,这正是稀疏文件的典型特征。这里需要注意的是,只有在NTFS格式的分区中创建的稀疏文件才不会占用创建数值大小的空间。
对于稀疏文件内容则可以借助DiskGenius软件来查看。启动程序后打开D盘,在右侧的窗格中找到并双击system文件,在打开的窗口中可以看到文件数据都是显示为“00”。
二、用活稀疏文件
通过上文的介绍了解了稀疏文件的含义及其创建的过程,在实际使用中就可以利用稀疏文件来为一些操作服务。如前言所述的可用空间管理案例,由于移动硬盘经常要借给同事使用,现在可以借助稀疏文件来更好地对可用空间进行个性化管理。
1.确定分区可用空间的数值
假设移动硬盘的盘符为D,首先将其回收站中的文件清空,接着查看移动硬盘的可用空间,如本例数值是151MB。
2.快速创建指定大小的稀疏文件
启动记事本程序并新建一个批处理文件1.bat,放置在D:\备用,代码如下:
set free1=1048576
set /p free2=请输入可用空间倍数(MB):
set /a free3=%free2%*%free1%
fsutil file createnew d:\system %free3%
fsutil sparse setflag d:\system
Attrib +h +s d:\system
这里可以使用稀疏文件尽可能地占用移动硬盘的可用空间,如设置稀疏文件占用150MB。运行上述批处理后在打开的窗口中输入150,回车即可。
此时再打开D盘查看创建文件前后的可用空间并加以比较,可以看到创建稀疏文件后可用空间就只剩余1.8MB(Windows对容量计算会略有误差)。
3.快速释放可用空间
为了方便自己使用,继续创建一个批处理文件2.bat,也放置在D:\备用,代码如下:
set free11=1048576
set /p free22=请输入需要使用空间倍数(MB):
set /a free4=%free22%*%free11%
fsutil sparse setrange d:\system 0 %free4%
在以后如果需要使用其中的100MB可用空间存储文件时,运行2.bat后输入100,那么稀疏文件的“0~104857600”字节空间(即100MB)就变为可用的存储空间。
再次打开D盘的“属性”窗口,可以看到此时的可用空间已经变为101MB了(含之前剩余的1MB)。这样自己需要使用多少空间就释放多少,释放完成后如果要重新填满空间,可以根据剩余空间大小,删除“d:\system”后再次运行1.bat,重新填充即可。
从上面的操作可以看到,本文介绍的方法和只是在移动硬盘中简单地存储无用文件来填充空间操作不同,通过fsutil命令可以在极短的时间内快速创建指定大小的“稀疏文件”。如有需求,可以在1秒内创建100GB大小的文件来填充空间,并可以快速设置稀疏区域来释放可用空间,非常适合对可用空间存储有特定需求的用户使用。
注意:一篇带你了解Windows Commands[Windows系统命令]常用命令
注意:在您阅读如下内容之前,请帮忙关注,并大力支持一下博主,thx
在我们的日常生活、学习或者工作中,接触到PC最多的应该是微软的window系统,但是我们只知道用鼠标进行图形化的方式进行操作,可能没有想过去了解使用命令行的方式操作,接下来我将带领大家一起学习windows commands,请和我走上学习Windows commands的路程吧。
在这篇文章中,你将会了解并掌握到如下的内容:
Command-line shells 命令行shell
Command shell file and directory name automatic completion 命令shell 文件和名称自动完成
Command-line reference A-Z 从A-Z的方式列出里参考
Windows和Windows server的所有支持版本都内置了 win32 控制台命令,这个文档集合描述了windows 命令行,你可以通过使用脚本或脚本工具完成一些自动化的任务
Command-line shells[shell命令行]
Windows操作系统拥有两种命令行的shenll:主要是shell 命令和powershell 命令。每一种shell都是一种软件程序,它们主要是提供了直接在我们和操作系统之间或应用程序间,提供一种环境自动完成IT 操作。
这个shell 命令行是shell最先内置到windows中去自动完成日常任务的工具,像使用批处理文件的方式进行用户账户管理或晚间备份。使用windows宿主脚本,我们可以运行更多复杂的脚本。此外关于脚本方面更多的信息,可以去学习cscript或者wscript。通过使用script比使用用户接口能够完成更多高效的操作。
powereshell 命令被设计成是Windows命令行的扩展,因此它拥有更多的能力完成更多的操作。使用windows命令行去运行powershell,然后回调cmdlets。cmdlets是和windows命令行很相似,但是它提供了更多可扩展的脚本语言。在powershell中,你可以同时运行windows command line 和powershell cmdlets,但是在命令行shell中只能运行windows command line ,而不支持powershell cmdlets。
为了能够获得Windows跟强大的自动化能力,所以建议大家使用powershell来替代windows 命令或者使用windows宿主自带的脚本。
Windows命令的退出和错误代码的参考可以在调试系统错误代码的文章找到,这样可以帮助我们理解错误的产生。
Command shell file and directory name automatic completion[shell 命令文件和目录名称自动完成]
在计算机或一个会话中,当一个特殊的控制操作符被按下的时候,我们可以配置shell 命令去自动完成文件和目录名称
Command-line reference A-Z
如下的命令,后续我将会陪伴你一起学习并动手实践操作,相信我们都会掌握它们,写完了,加油!
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unexposeuniqueidunlodctrV
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waitforwbadminwbadmin delete catalogwbadmin delete systemstatebackupwbadmin disable backupwbadmin enable backupwbadmin get diskswbadmin get itemswbadmin get statuswbadmin get versionswbadmin restore catalogwbadmin start backupwbadmin start recoverywbadmin start sysrecoverywbadmin start systemstatebackupwbadmin start systemstaterecoverywbadmin stop jobwdsutilwecutilwevtutilwherewhoamiwinntwinnt32winrswinsat memwinsat mfmediawmicwriterwscriptX
xcopy相关问答
windows系统可以创建20g文件吗?1.首先,windows系统是支持创建20gb文件的。windows操作系统具有非常强大的文件管理功能,可以创建、修改和删除各种大小的文件。2.要创建一个20gb的文件,可...
Windows怎么创建空文件?打开命令提示簿键入下面这行,路径填写你保存这个空文件的地方,最后的0就是代表创建出来的这个文件是0字节fsutilfilecreatenew路径0打开命令提示簿键...
1. 文件复制,完成一个程序,这个程序可以将指定文件夹中的内容复制到另一个文件夹中去。设计要求:1) 实?packagecom.qw.copy;importjava.io.BufferedInputStream;importjava.io.BufferedOutputStream;importja...
java设计:问题是编写程序计算圆柱体的体积和表面积编写程序...[回答]importjava.io.File;importjava.util.Scanner;publicclassTest{publicstaticvoidmain(String[]arg...
Python里面有什么好用且有趣的模块?在github里面找到的python框架,库,软件和资源的精选列表管理面板管理界面的库。ajenti-您的服务器应得的管理面板。django-grappelli-DjangoAdm...
Java面试题目网站有哪些?这个生存期由Javax.servlet.Servlet接口的init(),service()和destroy方法表达。Servlet被服务器实例化后,容器运行其init方法,请求到达时运行其serv...
...islab’sCanvaspageforasamplefile),writeaprogramtha_作业帮[回答]先生成你需要的文件,然后再读入文件,并计算结果。importjava.io.File;importjava.util.*;importjava.util.Random;importjava.i...
怎么用java读取pdf文件内容[回答]提供一个下载地址:http://pdfhome.hope.com.cn/Resource.aspx?CID=63844604-5253-4ae1-b023-258c9e324061&RID=2...
[Android]照相机范例代码 - OSCHINA - 中文开源技术交流社区[Android]照相机范例代码缘起这是一个照相的范例,可预览,也可存档。当初参...importjava.io.FileOutputStream;importjava.io.Outp...
有知道的吗 - OSCHINA - 中文开源技术交流社区packagecom.zovon.util;importjava.awt.AlphaComposite;importjava.awt.Color;importjava.awt.Font;...