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  o know the mode of your device. On an HDD, it is usually written on a label placed on the top cover after the word MODEL.

For example, the label shows:
HITACHI Deskstar — this is not a model, it is a trademark, see below:
MODEL: HDS722580VLSA80 — this is the disk model.

Knowing the model, we would immediately find that this is Hitachi Deskstar, 7,200 rpm of 80 GB capacity. Many drive models has their own specific problems, and that makes it easier for us to understand what went wrong.

All faults can be divided into logical, electronical, and mechanical. They have different symptoms. The table below helps you to understand what has happened.

Fault types

1. HDD not rotate

PC power On?
No
BAD controller
Yes
There are extraneous sounds
at startup? »»
No
Electrical problem
Yes
Mechanical problem

2. HDD rotate

Heads knock-knock »»
Yes
Heads bad
No
HDD recalibrate? »»
No
Firmware is BAD
Yes
HDD detected in BIOS
No
Firmware is BAD
Yes
HDD reading by logic
No
Firmware is BAD
Yes
SMART Ok?
No
Bad blocks
Yes
Logic infringements



These are the symptoms of the logical faults with possible causes in brief:

While computer's startup, BIOS recognizes all devices, but OS does not start
OS starts but some folders and/or files are inaccessible
Some files cannot be opened
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