If you use Windows defragger, you can not use any other software or doing any activities like back up data, downloading, or playing games while defragmentation process takes place. You can use automatic defragger like Diskeeper instead to allow you to defrag and use the computer at the same time.

Uninterruptible power supply (UPS) is needed for emergency power to prevent your hard drive being suddenly turned off when the power is going down.

Secure your data as quickly as possible to any external media like external hard disk if clicking noise heard from your hard drive when the computer is turned on, loud noise heard from your hard drive after using the computer for a while, and no hard drive icon visible in My Computer. Because this is the sign of hard drive mechanical failure and any data recovery software will not help you in this case. You can find a hard drive recovery expert to help you.

Please read more about hard drive defragmentation and computer data recovery issues

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