Err Msg: Error Defragmenting Drive <X>. Windows Could Not...

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Article ID: 160043 - View products that this article applies to.
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SYMPTOMS

When you run Disk Defragmenter (Defrag.exe), you may receive the following error message:
Error Defragmenting Drive <drive>. Windows could not access part of the drive. Click Help and carry out the instructions for running ScanDisk. IMPORTANT: To fix this problem, you must run ScanDisk and choose the Thorough option.
ID No: DEFRAG005
Note that the "ID No: DEFRAG005" portion of the error message may be replaced by "ID No: DEFRAG006."

CAUSE

This error occurs when Disk Defragmenter is unable to read from or write to one or more bad sectors on the hard disk. The DEFRAG005 error message is displayed when Disk Defragmenter is unable to write to a sector. The DEFRAG006 error message is displayed when Disk Defragmenter is unable to read from a sector.

RESOLUTION

Before you attempt to work around this problem, you should first make a backup copy of any important data on your hard disk. After doing so, run ScanDisk (Scandskw.exe) and perform a thorough test on the hard disk. To do so, follow these steps:
  1. Click the Start button, point to Programs, point to Accessories, point to System Tools, and then click ScanDisk.
  2. Click the hard disk referenced in the error message, and then click Thorough in the Type Of Test area.
  3. Click Options, verify that System And Data Areas is selected, and then click OK.
  4. Click Start to begin the test.
If ScanDisk does not find any bad sectors, or if running ScanDisk does not correct the problem, configure ScanDisk to detect disk timeouts and check each cluster five times while performing a surface scan. To do so, follow these steps:
  1. Use any text editor (such as Notepad) to open the Scandisk.ini file in the Windows\Command folder.
  2. Create an [Environment] section in the file, if the section does not already exist, and then add the following lines to the section:
    ScanTimeOut=On
    NumPasses=5
    Note that the "ScanTimeOut=" and "NumPasses=" lines may already exist, but with different values.
  3. Save and then close the Scandisk.ini file.
  4. Click the Start button, click Shut Down, click "Restart the computer in MS-DOS mode," and then click Yes.
  5. Type the following line and then press ENTER to run ScanDisk
    scandisk <drive>:
    where <drive> is the drive letter of the hard disk you want to check. Note that you should run a surface scan when ScanDisk prompts you to do so, repair any errors that ScanDisk finds, and view and save the log file that ScanDisk creates.
  6. When ScanDisk is finished, type exit and then press ENTER to return to Windows 95.
  7. Run Disk Defragmenter again.
If you still receive the above error message, run Disk Defragmenter to consolidate free space only, then defragment files only, and then perform a full defragmentation (both files and free space). To do this, follow these steps:
  1. Click Start, point to Programs, point to Accessories, point to System Tools, and then click Disk Defragmenter.
  2. Click the hard disk referenced in the error message, and then click OK.
  3. Click Advanced, click Consolidate Free Space Only, and then click OK.
  4. Click No when you are prompted to quit Disk Defragmenter.
  5. Click the hard disk referenced in the error message, and then click OK.
  6. Click Advanced, click Defragment Files Only, and then click OK.
  7. Click No when you are prompted to quit Disk Defragmenter.
  8. Click the hard disk referenced in the error message, and then click OK.
  9. Click Advanced, click "Full defragmentation (both files and free space)", and then click OK.
  10. Click Yes when you are prompted to exit Disk Defragmenter.
If ScanDisk does not find any bad sectors, or if running ScanDisk does not correct the problem, contact the manufacturer of your computer or hard disk to inquire about additional workarounds that may correct the problem.

MORE INFORMATION

Many hard disks have sectors that are unusable. If the sectors have been marked as bad by ScanDisk or another disk tool, Disk Defragmenter displays the sector as a white box with a red line through it. This indicates that the cluster has been marked as bad and cannot be used to store data.

If the disk tool you use is unable to detect bad sectors on your hard disk, or if you do not run a disk tool on a regular basis, unusable sectors that are not marked as bad may exist on the disk. When this occurs, you may not realize that the bad sectors exist until Windows 95 attempts to store data in them. Therefore, it is possible for bad sectors to appear while you are using the drive normally. If bad sectors begin to appear on a regular basis, your hard disk may need to be repaired or replaced.

Note that you may be able to prevent the error message from being displayed by deleting some files on your hard disk, but doing so does not fix the problem that is causing the error message to appear. Disk Defragmenter does not read from unused sectors while defragmenting a drive. Therefore, if an unusable sector that does not contain any data exists on your hard disk, the problem described in this article may not occur.

REFERENCES

For help with common system maintenance tasks in Windows Vista, visit the following Microsoft Web page:
Fix problems with common system maintenance tasks

Properties

Article ID: 160043 - Last Review: October 29, 2009 - Revision: 2.0
APPLIES TO
  • Microsoft Windows 95
  • Microsoft Plus! 95 Standard Edition
  • Microsoft Windows 98 Standard Edition
Keywords: 
kbdefrag kbenv kberrmsg kbscandisk KB160043

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