What Is Chkdsk Command & When to Use it?


Computer users may sometimes get a notice from Windows to run Chkdsk command to fix problem. Here comes several questions:

  • What is Chkdsk command?
  • What problem does it fix?
  • When to use Chkdsk command?

What is Chkdsk command?

Chkdsk is a command in Windows to bring up the process of examining disk space and disk use for the file allocation table (FAT) and NTFS file systems. Chkdsk provides information specific to each file system in a status report. The status report shows errors found in the file system. If you run chkdsk without the /f command-line option on an active partition, it might report spurious errors because it cannot lock the drive. You should use chkdsk occasionally on each disk to check for errors.


What problem does it fix?

Chkdsk find errors in your disk by checking the disk use and space. After that, it fixes the disk errors automatically. The errors including partition errors in hard drive, system not being able to recognize disk, empty disk suddenly being fully occupied, etc.


When to use Chkdsk command?

Normally, Windows will remind you to run chkdsk command when any disk error is causing problems.  Some programmes also has remind function when the software is detecting disk error thaat prevents it from installing or running.


Apart from these notices, users can also run Chkdsk to check disk regularly to avoid errors. Checking disk can help reduce the space that is occupied, and defrag the disk. Running disk checking regularly can keep the hard drive healthy and clean, and fix errors promptly.


There is only one disadvantage of Chkdsk command. It has to be run in a dos window. For beginners, this is relatively difficult because they don’t even know how to bring up the command window. I will suggest junior users check their disk and system with a system optimizer. It has all function of error cleaning as well as disk fixing and defragging. More over, it is so easy to use. For the best system optimizer, you can view this page for more information.

Resolve CD-ROM I/O Device Error


CD-ROM I/O Device Error is a common error message with CD-ROM drive. The error can be caused by two reasons:

  • 1. Disc is corrupted.
  • 2. Transfer mode is not supported by CD-ROM drive or has beed changed.


Due to above reasons, following methods could help you resolve the problem.


Method one: Check about the disc.

  • 1. Restart your computer.
  • 2. Open the CD-ROM drive and insert the disc.
  • 3. See if the disc inserted could be read by drive or not?
  • 4. Take the disc out of the drive and see if it can be read in a different computer.
  • 5. Insert a different disk into the drive on your computer and see if it can be accessed by the drive. If the disc is not being read correctly there may be a problem with the CD-ROM drive.


Method two: Change Transfer Mode of the IDE Channel

  • 1. Right click My Computer on desktop.
  • 2. Choose Properties.
  • 3. Then select Device Manager.
  • 4. Click on the “+” sign next to IDE ATA/ATAPI controllers to view the available controllers. Right-click on the Secondary IDE Channel and select “Properties” from the context menu.
  • 5. Click the Advanced Settings tab and then click the down arrow next to Transfer Mode under Device 0. Select “PIO Only” and then click the “OK” button.
  • 6. Close the Computer Management Window and then insert the disc in the drive and see if it can be read.


Method Three: Try an auto-fix tool registry cleaner  to fix the problem automatically. A lot of people recommend this program to resolve this issue.

  1. Download and install registry cleaner.
  2. Start the program, and on the interface click Start Scan button.
  3. After scanning, click Repair All button.

Easy Steps to Solve Error 0x8007045D


Error 0x8007045D is often seen when you try to backup files or transfer computer files to external drive. The error will appear as below:


The request could not be performed because of an I/O device error. Error 0x8007045D.


This error usually occurs because of corrupted registry files or insufficient permission to perform certain operation. There is no fixed solution for this error, but it is always not bad to troubleshoot it with some suggestions:


Disable your protective software

Protective software are always known to protect too much and mistakenly block some useful and necessary operations. Windows update, outlook, and system backup, are always prohibited by antivirus. It is worthwhile to try disabling your security software for a moment, and test the result. Sometimes, it is just so simple and easy to fix a problem.


Run chkdsk to fix hard drive problem

  • Log on to your system as administrator
  • Press Win+R button on your keyboard
  • Type cmd press enter
  • chkdsk c: /f
  • Press ENTER.
  • If you have file opened, then enter Y, press Enter to continue.


Defrag sytem files

  1. Start button, all programmes, click accessories
  2. Find system tools, choose disk manager
  3.  Right-click the basic volume which you wish to shrink 
  4. Click on Shrink Volume 
  5. Follow the onscreen instructions


 Clean registry erros with a registry cleaner

To fix error 0x8007045D many experts recommend using a good System Utilities software. It not only fixes errors in your system but also enhances the stability of your PC. The most important feature of such a software is the Registry cleaning function.


How To Keep Hard Disk Healthy

Hard disk is the basic of the a computer system. It is where all the information are written into and read from. If a hard disk is corrupted or injured, the stored information may be lost; more over, the system, which is counted on reading data from hard disk, may crash completely. You may totally lose this computer. The common disk errors are:


  • "Fatal Error - Cannot access hard disk"
  • "Hard disk drive failure"
  • "No fixed disk present"
  • "bad track"
  • "strange sounds when reading hard disk"


The reasons of such errors are complicated. Apart from the regular ageing of hard disk, it may also be caused by hear, low memory or too much dust. To keep the hard disk healthy, we wil need to clean and defrag hard disk regularly. In windows system, two tools are already equipped to help us. They are:


Disk Cleanup tool

Using this tool you can empty your Recycle Bin and remove the following items from your system

  • Temporary Internet Files
  • Downloaded Program Files, such as downloaded ActiveX Controls and Java Applets
  • Temporary Windows Files
  • Unwanted Windows Components
  • Unwanted Installed Programs

To start the Disk Cleanup utility, open the Start menu, point to All Programs, and then point to Accessories. Next, point to System Tools, and then select the Disk Cleanup command.


Disk defragmenter

Over time, the files that belongs to specific programs may be stored all over the hard disk where the space is available. This tool will help you to tidy up the files and keep them within the correct folder to save time for the system to find and read the files.

To run the Disk Defragmenter on your hard disk, open the Start > All Programs > Accessories > System Tools > Disk Defragmenter command. In the Disk Defragmenter window that opens, select the volume you want to defrag and then select the Defragment button.


Apart from above two tools, you can also refer to third party program to clean up your disk and keep it healthy. A registry cleaner and system optimizer will not only do above for you, but also clean regularly and automatically, and scan your registry errors and other junk files to free up space in your hard disk.


How to Defrag Disk by SmartPCFixer

Disk Defrag: You can defrag your disk to enhance the performance of your computer. This involves first analyzing whether your computer files are sufficiently fragmented to warrant defrag. After the analysis is complete you can defrag if notified to do so.


Defrag Disk as instructed:

  1. Click the System Tools button on the left side, and then click the File Defrag button.
  2. Click Refresh Disk button. If you don’t want to refresh removable disks, choose Skip Removable Disks.
  3. Click the disc you want to optimize one by one, and then click Optimize button. The Cluster Map will show the result.
  4. If you want to stop optimization, click Stop button.