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Under Linux, you can read the SMART (Self-Monitoring, Analysis and Reporting Technology) information from the hard disk using smartctl. In this example, we will show how to analyze a defective hard disk. The hard disk in this example can no longer read several sectors and is therefore defective. It has to be replaced.

The Disk Utility app received a major overhaul in OS X El Capitan, but Apple removed one key feature that is crucial to many Mac power users: RAID support. Thankfully, there's a workaround, at least for now. Here's how to create and manage RAID volumes in OS X El Capitan. Smartmontools contains utility programs (smartctl, smartd) to control/monitor storage systems using the Self-Monitoring, Analysis and Reporting Technology System (S.M.A.R.T.) built into most modern ATA and SCSI disks. How to download photos from iphone in mac. It is derived from smartsuite. The smartctl man page on my boxes provides a link to one of its authors' article in Linux Journal; in particular, listing 3 explains the output of smartctl -a. Even though it's over 10 years old, having read it I find it's still relevant and provides an authoritative explanation.

1Displaying SMART Information
2SMART Tests

Displaying SMART Information

The smartctl -a /dev/DEVICENAME command will display all SMART information for the affected hard disk. The hard disk in this example is showing increased errors for multiple SMART settings.

Analysis

In this example, the following values are interesting for the detailed analysis.

The RAW_VALUE of the Current_Pending_Sector value indicates how many of the hard disks sectors can no longer be read and are waiting for re-mapping.^[1] You will find detailed information about the other error codes in the ATA S.M.A.R.T. Attributes section of the Wikipedia article about SMART.^[2]

SMART Tests

SMART supports several hard disk tests. Enable siri mac mojave talk to open apps. You can find the details on the man page for smartctl.

Short Test

We will start a short test in this example.

Displaying the Test Results

The test results will be displayed by the command: smartctl -l selftest /dev/sdb. The LBA address is obviously the first defective sector in this example.

Forcing Re-mapping a Defective Sector

https://yellowantique956.weebly.com/blog/mac-dock-which-apps-appear. When you write to a defective sector, the hard disk will attempt to re-map the affected sector. The original content of the sector will be lost by this procedure. You will find details about this on the Bad Block HOWTO page.^[3]

The following command will display the remapping process for a sector. F1 2001 pc demo download. The Current_Pending_Sector counter will be reduced (these steps were performed according to the Bad Block HOWTO page). https://fishingyellow966.weebly.com/blog/active-directory-documentation-pdf.

Another set of tests will be started and another remapping procedure will be performed.

References

↑9133: S.M.A.R.T. Attribute: Current Pending Sector Count (Acronis Knowledge Base)
↑S.M.A.R.T. (en.wikipedia.org)
↑Bad block HOWTO for smartmontools

Retrieved from 'https://www.thomas-krenn.com/en/wikiEN/index.php?title=Analyzing_a_Faulty_Hard_Disk_using_Smartctl&oldid=4494'

Opened 11 years ago

Closed 8 years ago

Last modified 8 years ago

#25closedenhancement (worksforme)

Reported by:	Owned by:
Priority:	minor	Milestone:
Component:	all	Version:	5.39
Keywords:	Cc:

Change History (30)

comment:1 Changed 11 years ago by

Summary:	SCSI pass through for SMART via USB on MacOSX Rsync? 3rd party code available! → SCSI pass through for SMART via USB on MacOSX smartmontools? 3rd party code available!

comment:2 Changed 11 years ago by

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Owner:	changed from somebody to cooties
Status:	new → accepted

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Keywords:	macosx added; macusbscsi-pass-through removed

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