Click Start, point to Programs, point to Accessories, point to System Tools, and then click Disk Defragmenter. No when you are prompted to quit Disk Defragmenter. No when you are prompted to quit Disk Defragmenter. 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.
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.