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The chkdsk program needs to check all structures on the disk, including ones the Operating System would be using if it was running on that disk. Therefore to check the disk that Windows is installed on chkdsk must run before Windows is started, so that those structures are not in use.

If you have multiple disks on the machine the other ones (i.e. that Windows is not installed on) may have chkdsk run on them at anytime.

Note: there are some utilities other than chkdsk that can check a disk that is in use by the Operating System. They perform a "Live Disk Check" instead if they find that the disk is in use by the Operating System by skipping checks on the structures where the conflicts occur and checking the rest. Obviously this is not as complete as the checks done by chkdsk, but it can be done anytime.

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Q: When you ran the chkdsk command it had to run during startup process why was this necessary?
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Related questions

How do you enter DOS command help?

Use "/?" option with command. For example, if you want help for "chkdsk" command, enter "chkdsk /?" and press enter.


How do you run chkdsk utility?

you can run chkdsk from dos. If you are using windows, you would need to open a command prompt (usually located in the accessories folder) and then type chkdsk in the ensuing prompt. you can type chkdsk /? for commands that you can use with chkdsk.


How do you run checksum from DOS prompt?

You can do it by using "chkdsk" command.


What DOS command checks the condition of a disk?

chkdsk


Which command in DOS displays the status of a disk?

You can use "fdisk' or "chkdsk"


Which DOS command displays the status of a disk?

You can use "fdisk' or "chkdsk"


When you want to use Chkdsk to fix the file system errors and the drive is not locked when does Windows schedule the Chkdsk command to run?

The next time windows is restarted.


Show how to use the CHKDSK command and FIX all problems CHKDSK may find with out user input?

Chkdsk (Chkdsk.exe) is a command-line tool that checks volumes for problems. The tool then tries to repair any that it finds. For example, Chkdsk can repair problems related to bad sectors, lost clusters, cross-linked files, and directory errors. To use Chkdsk, you must log on as an administrator or as a member of the Administrators group. You can also run Chkdsk from My Computer or from Windows Explorer. You also need to repair your windows registry to sppedup your computer.


What command do you use to repair the file system and recover data from bad sectors?

chkdsk\r


What are the steps to running the chkdsk utility on a PC?

There are four steps to running the chkdsk utility on a PC. You can learn exactly how to go through these four steps by going online to WikiHow- run chkdsk. They will walk you through the process.


A command fixes file system errors and recovers data from bad sectors?

on windows "chkdsk /r"


Where do you run the chkdskr command from?

It's "chkdsk /r" and you run it from a command line. The easiest way to do this is to click Start, Run, then type this command in exactly as it appears here without the quotes. Then hit ENTER.