How do I make a file a specific size?

Asked By: Kelia Caldinhas | Last Updated: 2nd February, 2020
Category: technology and computing operating systems
3.9/5 (57 Views . 40 Votes)
To create a file of specific size in Windows 10, do the following.
  1. Open an elevated command prompt.
  2. Type or copy-paste the following command: fsutil file createnew <filename> <length>
  3. Substitute the <filename> portion with the actual file name.
  4. Substitute <length> with the desired file size in BYTES.

Click to see full answer


Likewise, people ask, how do I make a file a specific size in Linux?

6 Methods to create files of specific size in Linux

  1. fallocate: fallocate is used to preallocate or deallocate space to a file.
  2. truncate: truncate is used to shrink or extend the size of a file to the specified size.
  3. dd: Copy a file, converting and formatting according to the operands.

Also, how do I make a large file in Windows? Open up Windows Task Manager, find the biggest process you have running right click, and click on Create dump file . This will create a file relative to the size of the process in memory in your temporary folder. You can easily create a file sized in gigabytes.

Also asked, how do I create a test file?

For example, to create a 10 megabyte test file:

  1. Click on the 'Start' button.
  2. In the search box type 'cmd'
  3. Right-click on Command Prompt and choose 'Run as administrator'
  4. Enter the following command:
  5. fsutil file createnew C:TestFile.txt 10485760.
  6. The file will be located in the C: directory.

How do I truncate a file?

The easiest and most used method to truncate files is to use the > shell redirection operator.

Let's break down the command:

  1. The : colon means true and produces no output.
  2. The redirection operator > redirect the output of the preceding command to the given file.
  3. filename , the file you want to truncate.

23 Related Question Answers Found

What is Fallocate?

fallocate is used to manipulate the allocated disk space for a file, either to deallocate or preallocate it. For filesystems which support the fallocate system call, preallocation is done quickly by allocating blocks and marking them as uninitialized, requiring no IO to the data blocks.

How do I check the size of a file in Linux?

Usage. ls -l --block-size=M will give you a long format listing (needed to actually see the file size) and round file sizes up to the nearest MiB. If you want MB (10^6 bytes) rather than MiB (2^20 bytes) units, use --block-size=MB instead.

How do you create a file in Linux?

To create a new file run the cat command followed by the redirection operator > and the name of the file you want to create. Press Enter type the text and once you are done press the CRTL+D to save the files.

What is truncate Linux?

The Linux truncate command is often used to shrink or extend the size of each FILE to the specified size. If a FILE (for example archive or log files) is larger than the specified size, the extra data is lost, but if a FILE is shorter, it is extended and the extended part (hole) reads as zero bytes.

What is dd on Linux?


'dd' command in Linux. dd is a command-line utility for Unix and Unix-like operating systems whose primary purpose is to convert and copy files. On Unix, device drivers for hardware (such as hard disk drives) and special device files (such as /dev/zero and /dev/random) appear in the file system just like normal files.

How create 1 GB file in Linux?

Linux / UNIX: Create Large 1GB Binary Image File With dd Command
  1. fallocate command – Preallocate space to a file.
  2. truncate command – Shrink or extend the size of a file to the specified size.
  3. dd command – Convert and copy a file i.e. clone/create/overwrite images.
  4. df command – Show free disk space.

How do you delete a file in Linux?

To remove (or delete) a file in Linux from the command line, use either the rm (remove) or unlink command. The unlink command allows you to remove only a single file, while with rm you can remove multiple files at once.

What is a dummy file?

dummy file. [′d?m·ē ′fīl] (computer science) A nonexistent file which is treated by a computer program as if it were receiving its output data, when in fact the data are being ignored; used to suppress the creation of files that are needed only occasionally.

What is test file?

What is a TEST file? The TEST file type is primarily associated with Apple II operating system.

How do I create a text file in Windows?


Microsoft provides a way of creating a new, blank text file using the right-click menu in File Explorer. Open File Explorer and navigate to the folder where you want to create the text file. Right-click in the folder and go to New > Text Document. The text file is given a default name, New Text Document.

How do I make an empty file in Windows?

MS-DOS and Windows command line users
Use the copy con command to create an empty file, as shown below. The ^Z represents pressing Ctrl + Z on the keyboard when at a command prompt. After pressing this shortcut, you should get a 1 file copied message.

How do I create a file in Windows 7?

Windows 7: To create new folders in Windows, you have a few options: you could right-click, go to New, then click Folder, or you could mouse over to the "New Folder" button in the taskbar in Windows Explorer, but both are more time consuming that this simple shortcut: Ctrl+Shift+N.

How do I make a PDF larger?

Here's how . . .
  1. Create your document in the tool of your choice and make note of the page size.
  2. Choose File>Print.
  3. Select the AdobePDF Printer.
  4. Click the Settings option for the Adobe PDF Printer.
  5. In the Adobe PDF Document Properties window, click the Add button . . .
  6. Give the new page size a name.

How do I increase text size?

Use ChompSMS to send your text message.

Android: Increase MMS File Size Limit
  1. Once you've downloaded and installed the app, open it and select “Menu” > “Settings” > “MMS“.
  2. You will see an option for “Carrier Send Limit“.
  3. Set the limit to “4MB” or “Carrier has no limit“.

How do I create a big dummy file in Linux?


To create a big (empty) file, set $INPUT-FILE=/dev/zero . Total size of the file will be $BLOCK-SIZE * $NUM-BLOCKS . New file created will be $OUTPUT-FILE . This approach is especially useful to subsequently mmap the file into memory.