HDDのマウントエラー

ブレーカが落ちてしまって、データ用のHDDがマウントできなくなってた。

mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

ログ

smartd[534]: Device: /dev/sdb [SAT], 65528 Currently unreadable (pending) sectors
smartd[534]: Device: /dev/sdb [SAT], 4 Offline uncorrectable sectors

sudo smartctl -A /dev/sdb

smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.8.0-59-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.8.0-59-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
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   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   173   171   021    Pre-fail  Always       -       6325
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       159
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   028   028   000    Old_age   Always       -       52883
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       93
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       70
193 Load_Cycle_Count        0x0032   158   158   000    Old_age   Always       -       127529
194 Temperature_Celsius     0x0022   121   097   000    Old_age   Always       -       29
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   001   001   000    Old_age   Always       -       65528
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       4
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       1
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       10

sudo smartctl -t short /dev/sdb

Testing has begun.

Please wait 2 minutes for test to complete.
Test will complete after Sat May 19 20:26:10 2018

2分待てと出たので待つ。容量によっては時間が変わる。

sudo smartctl -l selftest /dev/sdb

smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.8.0-59-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed: read failure       90%     52883         127803448

sudo dumpe2fs -h /dev/sdb1 | grep Block

dumpe2fs 1.43.3 (04-Sep-2016)
Block count:              488378000
Block size:               4096
Blocks per group:         32768

バッドセクタのチェック

sudo badblocks -vs -o badblocks.txt /dev/sdb1

badblocks.txtに以下の様に書き出される。
結構あるなー。。。

75497472
75497473
77878496
77878497
77878498
77878499
77878500
77878501
77878502
146801524
146801525
146801526
146801527
146801528
146801529
146801530
146801531
176160768
176160769
176160770
176160771

データしか置いていないので、修正は全部yesで

sudo e2fsck -y -l badblocks.txt  /dev/sdb1

smartctlでチェック

sudo smartctl -t short /dev/sdb

sudo smartctl -l selftest /dev/sdb

※エラーがない場合結果の行が増えないので、selftestは先に結果だけ取って置いた方がいいかも？

sudo mount -a

で無事マウント。