Possible Symptoms

• Error message stating the device is not recognized
• Previously accessible data suddenly gone
• Scraping or rattling sound
• Hard drive not spinning
• Computer hard drive doesn't function

Examples

• Electrical failure
• Head/media crash
• Controller failure

Preventive Measures

• Protect electrical components by using computers in a dry, shaded, dust-free area
• Protect against power surges with an uninterruptible power supply (UPS)
• Do not shake or remove the covers on hard drives or tapes.

Possible Symptoms

• Previously accessible data suddenly gone
• Message similar to "File Not Found"

Examples

• Accidental deletion or drive format
• Trauma caused by drop or fall

Preventive Measures

• Never attempt any operation, like installations or repairs, with which you don't have experience
• Avoid moving your computer, especially when it's in operation

Possible Symptoms

• System messages relating to memory errors
• Software application won't load
• Error message stating data is corrupted or inaccessible

Examples

• Corruption caused by diagnostic or repair tools
• Failed backups
• Configuration complexity

Preventive Measures

• Back up data regularly
• Use diagnostic utilities with caution

Possible Symptoms

• Blank screen

• Strange and unpredictable behavior
• Error message stating
• "File Not Found" Message announcing virus appears on screen

Examples

• Boot sector viruses
• File infecting viruses
• Polymorphic viruses

Preventive Measures

• Use a good anti-virus package
• Obtain software from reputable sources
• Scan all incoming data, including packaged software, for viruses

Possible Symptoms

• While floods and earthquakes have obvious symptoms, brownouts and lightning strikes often leave no clues

Examples

• Fires
• Floods
• Brownouts

Preventive Measures

• Store tested backups in an off-site location
• Install a UPS
• Don't store critical data in a flood plain