Run defrag at a command prompt to run disk

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Run Defrag at a command prompt to run Disk Defragmenter in a text mode. Check Disk Check Disk is a utility that verifies the file system integrity of a hard disk. Errors that can be checked and fixed by Check Disk include: Lost clusters are a series of used clusters on the hard disk drive that are not associated with a specific file. A cross-linked file occurs when two files claim the same cluster. Check Disk will identify cross-linked files and correct their cluster associations. Orphaned files are files that exist on the hard drive but which are not associated with a directory in the index. Normally Check Disk can re-associate the file with the correct directory. A bad sector is a portion of the hard disk that cannot be used. Bad sectors are marked so that they are no longer used. Any used bad sectors are redirected to another sector. The NTFS file system automatically detects bad sectors as the system operates saving and reading files. You can run Check Disk by typing Chkdsk at a command prompt. Use Chkdsk with the /f switch to automatically fix errors without scanning for bad sectors. Use the /r switch to scan and fix bad sectors and other errors. Common Storage Issues 0:00-0:28 In this lesson, we're going to discuss several common issues with storage devices. Hard disks are mechanical devices that wear out over time. It's not a matter of if a hard disk will fail.It's a matter of when. Every hard disk has a parameter associated with it called the mean time before failure or MTBF. The MTBF identifies an estimated lifespan for the disk. Hard Disk Considerations 0:29-1:07
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Because all hard disk drives will eventually fail, you need to back them up on a regular basis. You should use an automated tool that backs up the disk on a set schedule without your intervention.Relying on a person to remember to run backups is not a good strategy. Another thing to remember about hard disk drives is the fact that they are sealed units. This prevents contaminants from damaging the hard disk platters. Because it is sealed, there are no maintenance tasks that you can perform on the disk itself. For example, you can't open a disk and replace a motoror a read/write head. Instead, if the disk is failing, you should just replace it. Disk Space Consumption 1:08-2:01 Let's review several common problems that you may encounter with storage devices. One of the most common problems is that of slow performance. After a hard disk has been in use for a period of time, it's performance tends to degrade. Remember, that a mostly empty hard disk drive usually performs better than a mostly full hard disk drive. If a disk is getting full, consider upgrading to a bigger drive. A heavily fragmented disk also performs poorly so keep hard disks defragmented regularly, using the defragmentation tool provided by the operating system. Be aware that extra free space is required in order to fully defragment a hard drive. If you don't have enough free space available, most defragmentation tools will warn you that they can't completely defrag the drive. Again, keeping a reasonable amount of free space available will allow the drive to be fully defragmented.
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  • Spring '14
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