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Introduction
If you are evaluating a used or questionable hard drive, this guide will show you how to do basic hard drive testing. '''While these tests are not perfect, most drive problems will be exposedappear.'''
Many common drive problems include:
* High hours (Wear and tear)
* Hidden problems
* Reallocated sectors
* Pending reallocated sectors
=== Why should used hard drives be checked? ===
'''Most failures are sudden.''' If these problems are caught early, the drive can be replaced before it fails. SMART plays a major role in this, since the data can be used to check for logs and failure patterns.
'''Note:''' Some hard drives (Ex: Seagate 7.01/7200.11) are known to fail. Others fail due to lower quality standards (Ex: WD Blue/Green).
=== Guide notes ===
* '''While Parted Magic can legally be redistributed per the GPL, I will not point to these downloads.'''
* '''The tests used in this guide are not 100% accurate.'''
=== A word on drive remapping ===
* '''While [https://support.wdc.com/downloads.aspx?p=2|WD], [https://www.hgst.com/support/hard-drive-support/downloads|HGST] and [https://www.seagate.com/support/downloads/seatools/|Seagate] offer diagnostic tools, these do not work in every scenario (Ex: Lots of bad sectors).'''
* '''Before attempting a sector remap, backup your data.'''
* '''Drives with SMART errors should be replaced.'''