If you have had a major computer data loss or hard disk failure that resulted in the loss of major data stored in your computer, the measurement of the effectiveness of the data recovery process lies in the time period it takes for you to recover the data or to restore the data in its entirety.
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Another option is using it remotely, to backup files from computers connected to yours. If you use a cron job you can even automate the process, without any work on your part. The cron command allows you to receive an email notification when the backup job is completed.
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The most common problem among Hard disk drives is bad sector. There are two types of bad sectors: logical and physical. While logical bad sectors are easily fixed using particular software, physical bad sectors can be irreparable. But it doesn't mean there is absolutely no hope, there is still a chance to recover the bad sectors depending on how "deep" the bad sectors are. So, below I am going to consider only physical bad sectors, their symptoms, reasons for appearing, types and ways for possible maintenance.
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