smartctl output for Crucial 512Gb SSD

Hi

My m4 512Gb CT512M4SSD1 suddenly failed to read. Below is the smartctl
output that returns eventually, taking at least a couple of minutes.  I've
tried 2 different USB caddys and also SATA connection to laptop running
livecd.  The drive has exclusively been mounted read-only on a Linux system
with an ext4 filesystem, and has had unexpected power loss routinely
throughout its life.  The values in the attribute table look OK to me I
think, but the serious errors at the bottom look bad.  Any ideas greatly
appreciated:



root@w530:/dev# smartctl --all /dev/sdb
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.8.0-41-generic] (local build)
Copyright (C) 2002-11 by Bruce Allen,http://
<http://smartmontools.sourceforge.net/>smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Device Model:     M4-CT512M4SSD1
*removed personal information*
LU WWN Device Id: 5 00a075 1091fcc21
Firmware Version: 070H
User Capacity:    512,110,190,592 bytes [512 GB]
Sector Size:      512 bytes logical/physical
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  ATA-8-ACS revision 6
Local Time is:    Tue Aug 12 12:02:50 2014 BST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
Warning: This result is based on an Attribute check.

General SMART Values:
Offline data collection status:  (0x80)    Offline data collection activity
                    was never started.
                    Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0)    The previous self-test routine
completed
                    without error or no self-test has ever
                    been run.
Total time to complete Offline
data collection:         ( 2380) seconds.
Offline data collection
capabilities:              (0x7b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    Conveyance Self-test supported.
                    Selective Self-test supported.
SMART capabilities:            (0x0003)    Saves SMART data before entering
                    power-saving mode.
                    Supports SMART auto save timer.
Error logging capability:        (0x01)    Error logging supported.
                    General Purpose Logging supported.
Short self-test routine
recommended polling time:      (   2) minutes.
Extended self-test routine
recommended polling time:      (  39) minutes.
Conveyance self-test routine
recommended polling time:      (   3) minutes.
SCT capabilities:            (0x003d)    SCT Status supported.
                    SCT Error Recovery Control supported.
                    SCT Feature Control supported.
                    SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED
WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   100   100   050    Pre-fail
Always       -       0
  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail
Always       -       0
  9 Power_On_Hours          0x0032   100   100   001    Old_age
Always       -       4439
 12 Power_Cycle_Count       0x0032   100   100   001    Old_age
Always       -       515
170 Unknown_Attribute       0x0033   100   100   010    Pre-fail
Always       -       0
171 Unknown_Attribute       0x0032   100   100   001    Old_age
Always       -       0
172 Unknown_Attribute       0x0032   100   100   001    Old_age
Always       -       0
173 Unknown_Attribute       0x0033   100   100   010    Pre-fail
Always       -       0
174 Unknown_Attribute       0x0032   100   100   001    Old_age
Always       -       398
181 Program_Fail_Cnt_Total  0x0022   100   100   001    Old_age
Always       -       618478239843
183 Runtime_Bad_Block       0x0032   100   100   001    Old_age
Always       -       0
184 End-to-End_Error        0x0033   100   100   050    Pre-fail
Always       -       0
187 Reported_Uncorrect      0x0032   100   100   001    Old_age
Always       -       0
188 Command_Timeout         0x0032   100   100   001    Old_age
Always       -       0
189 High_Fly_Writes         0x000e   100   100   001    Old_age
Always       -       215
194 Temperature_Celsius     0x0022   100   100   000    Old_age
Always       -       0
195 Hardware_ECC_Recovered  0x003a   100   100   001    Old_age
Always       -       0
196 Reallocated_Event_Count 0x0032   100   100   001    Old_age
Always       -       0
197 Current_Pending_Sector  0x0032   100   100   001    Old_age
Always       -       0
198 Offline_Uncorrectable   0x0030   100   100   001    Old_age
Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   100   100   001    Old_age
Always       -       0
202 Data_Address_Mark_Errs  0x0018   100   100   001    Old_age
Offline      -       0
206 Flying_Height           0x000e   100   100   001    Old_age
Always       -       0

Read SMART Log Directory failed.

Error SMART Error Log Read failed: scsi error medium or hardware error
(serious)
Smartctl: SMART Error Log Read Failed
Error SMART Error Self-Test Log Read failed: scsi error medium or hardware
error (serious)
Smartctl: SMART Self Test Log Read Failed
Error SMART Read Selective Self-Test Log failed: scsi error medium or
hardware error (serious)
Smartctl: SMART Selective Self Test Log Read Failed

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