Re: smartctl output for Crucial 512Gb SSD

Mike wrote:
> Greetings
>
> Following on from previous message, where running smartctl with the
> disk connected via SATA returns a 600PB disk (it is actually 512Gb
> Crucial M4), I followed advice from the Crucial message boards and
> left the disk idle over night in order to trigger automatic garbade
> collection.  No change the next morning, below is some smartctl
> output.  I've tried ddrescue to no avail, reads just fail completely.
> ...
> smartctl 6.3 2014-07-26 r3976 [x86_64-linux-3.13.0-34-generic] (local build)
> Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org
>
> === START OF INFORMATION SECTION ===
> Model Family:     Crucial/Micron RealSSD m4/C400/P400
> Device Model:     M4-CT512M4SSD1
> ...
> Read SMART Log Directory failed: scsi error medium or hardware error (serious)
>

This error message is probably due to a limitation/bug in 
driver/firmware of the used (which?) controller. The device itself 
should support SMART Log Directory.


> General Purpose Log Directory Version 1
> Address    Access  R/W   Size  Description
> 0x00       GPL     R/O      1  Log Directory
> 0x03       GPL     R/O  16383  Ext. Comprehensive SMART error log
> 0x04       GPL     R/O    255  Device Statistics log
> 0x07       GPL     R/O   3449  Extended self-test log
> ..
> SMART Extended Comprehensive Error Log size 16383 not supported
>
> Read SMART Error Log failed: scsi error medium or hardware error (serious)
>
> SMART Extended Self-test Log size 3449 not supported
>
> Read SMART Self-test Log failed: scsi error medium or hardware error (serious)

The extended error/self-test logs may contain useful info. Unfortunately 
smartctl does not print the extended logs due to a historic size 
limitation. In the early days of these logs, sizes were <= 8.

If possible, apply the attached patch and try whether the logs could be 
read then.

Thanks,
Christian

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Index: ataprint.cpp
===================================================================
--- ataprint.cpp	(revision 3977)
+++ ataprint.cpp	(working copy)
@@ -3106,7 +3106,7 @@
     unsigned nsectors = GetNumLogSectors(gplogdir, 0x03, true);
     if (!nsectors)
       pout("SMART Extended Comprehensive Error Log (GP Log 0x03) not supported\n\n");
-    else if (nsectors >= 256)
+    else if (nsectors >= 20000)
       pout("SMART Extended Comprehensive Error Log size %u not supported\n\n", nsectors);
     else {
       raw_buffer log_03_buf(nsectors * 512);
@@ -3159,7 +3159,7 @@
     unsigned nsectors = GetNumLogSectors(gplogdir, 0x07, true);
     if (!nsectors)
       pout("SMART Extended Self-test Log (GP Log 0x07) not supported\n\n");
-    else if (nsectors >= 256)
+    else if (nsectors >= 20000)
       pout("SMART Extended Self-test Log size %u not supported\n\n", nsectors);
     else {
       raw_buffer log_07_buf(nsectors * 512);