CentOS 7.1 で操作しています。
■関連記事 中古 HDD の初期確認、２個目（2015年10月）
まず、とりあえず、認識されなれば、そこで終わりですが、
[ 3.239373] scsi 3:0:0:0: Direct-Access ATA SEAGATE ST310003 NA02 PQ: 0 ANSI: 5 [ 3.239662] sd 3:0:0:0: [sdd] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB) [ 3.240247] sd 3:0:0:0: [sdd] Write Protect is off [ 3.240338] sd 3:0:0:0: [sdd] Mode Sense: 00 3a 00 00 [ 3.240477] sd 3:0:0:0: [sdd] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 3.260270] sd 3:0:0:0: [sdd] Attached SCSI diskこれは OK でした。ただし、しばらく試運転していて、どうも遅いと思ったら、Write cache が disabled になっていることに気がつきました。どうやら、このディスクは、RAID コントローラ配下で利用されていたのかもしれません。LSI とかの RAID コントローラ配下の場合、デフォルトでは HDD のキャッシュが off にされていることが多いですから。
キャッシュを enable にするには、hdparm -W1 コマンドを使えばいいです。
[root@hoge ~]# hdparm -W1 /dev/sdd
/dev/sdd:
setting drive write-caching to 1 (on)
write-caching = 1 (on)
[root@hoge ~]# hdparm -i /dev/sdd
dev/sdd:
Model=SEAGATE ST31000340NS, FwRev=NA02, SerialNo=xxxxxxxx
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=1953525168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=no WriteCache=enabled
Drive conforms to: unknown: ATA/ATAPI-4,5,6,7
* signifies the current active mode
次に S.M.A.R.T. の確認です。
[root@hoge ~]# smartctl -a /dev/sdd
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-229.4.2.el7.x86_64] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Device Model: SEAGATE ST31000340NS
Serial Number: xxxxxxxx
LU WWN Device Id: 5 000c50 yyyyyyyy
Firmware Version: NA02
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
Sector Size: 512 bytes logical/physical
Rotation Rate: 7200 rpm
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: ATA8-ACS T13/1699-D revision 4
SATA Version is: SATA 2.6, 3.0 Gb/s
Local Time is: Mon Jun 15 18:09:51 2015 JST
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
General SMART Values:
Offline data collection status: (0x82) Offline data collection activity
was completed without error.
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: ( 634) 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: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 227) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x103f) SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 084 063 044 Pre-fail Always - 237886154
3 Spin_Up_Time 0x0003 099 091 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 179
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 076 060 030 Pre-fail Always - 13038515776
9 Power_On_Hours 0x0032 048 048 000 Old_age Always - 45906
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 037 020 Old_age Always - 132
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0
188 Command_Timeout 0x0032 100 100 000 Old_age Always - 0
189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0
190 Airflow_Temperature_Cel 0x0022 062 055 045 Old_age Always - 38 (Min/Max 27/38)
194 Temperature_Celsius 0x0022 038 045 000 Old_age Always - 38 (0 13 0 0 0)
195 Hardware_ECC_Recovered 0x001a 051 047 000 Old_age Always - 237886154
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
No self-tests have been logged. [To run self-tests, use: smartctl -t]
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
不良セクタの有無なども勿論気になるところですが、まずは運用年数を確認です。9 Power_On_Hours の値が 45906 なので、
[root@hoge ~]# echo "45906 / 24 / 365" | bc -l 5.24041095890410958904だいたい、きっちり 5年 ですね。うーん、プロの仕業でしょうか。ガタが来る前にリフレッシュですかね。
ちなみに HGST だと、ラベルに製造年月が書いていますが、今回入手した Seagate 製品（Barracuda ES.2）のラベルには記載ありませんでした。2015-06-20追記、後日よく見てみたら、Date Code: 09364 と記載ありました。http://www.j-pro.info/remake/sgcalc.php こちらのツールによると 03/2009 を意味するそうです。というわけで６歳でした。
そして、不良セクタ関係の項目（5 Reallocated_Sector_Ct、197 Current_Pending_Sector など）は、どれもゼロでした。
エラーログも無し（No Errors Logged）です。
なかなか、良さげな個体を安価に入手できたように思います。
なお、新品であれば、全セクタ検査などしてから使い始めるのが私の慣例ですが、中古であるし、ZFS で冗長化して使うので、そのまま投入して使い倒すのみです。返品できないし、ベンダの保証も無いですから。
2015-06-20追記
初期確認では、S.M.A.R.T. は全く問題なさそうな状態でしたが、実際に RAIDZ に組み込んでみた（故障した HDD と zpool replace した）ところ、resilver（ZFS の用語でリビルドのこと）は問題なく成功したものの、そのあと更に、zpool scrub（整合性チェック）を行なったら、ATA bus error が多発しました。
smartctl -A の値を確認したところ、197 Current_Pending_Sector および 198 Offline_Uncorrectable の値が 6 になってました。つまり不良セクタが生じたことを示唆していました。過去の経験から、この程度ならまだ諦めることはなく、不良セクタの LBA 番号を確認して、そのセクタにゼロ書き込みすることで、代替セクタへの切り替えを促すことができると思われました。実際、手間はかかりましたが、うまく行きました。
次が、不良セクタの処置を終えたあとの smartctl -a の出力です。
[root@hoge ~]# smartctl -a /dev/sdd
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-229.4.2.el7.x86_64] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Device Model: SEAGATE ST31000340NS
Serial Number: xxxxxxxx
LU WWN Device Id: 5 000c50 yyyyyyyyy
Firmware Version: NA02
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
Sector Size: 512 bytes logical/physical
Rotation Rate: 7200 rpm
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: ATA8-ACS T13/1699-D revision 4
SATA Version is: SATA 2.6, 3.0 Gb/s
Local Time is: Fri Jun 19 17:36:23 2015 JST
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
General SMART Values:
Offline data collection status: (0x82) Offline data collection activity
was completed without error.
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: ( 634) 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: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 227) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x103f) SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 079 047 044 Pre-fail Always - 87683421
3 Spin_Up_Time 0x0003 099 091 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 183
5 Reallocated_Sector_Ct 0x0033 082 082 036 Pre-fail Always - 388
7 Seek_Error_Rate 0x000f 076 060 030 Pre-fail Always - 13040071396
9 Power_On_Hours 0x0032 048 048 000 Old_age Always - 46000
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 037 020 Old_age Always - 136
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 001 001 000 Old_age Always - 507
188 Command_Timeout 0x0032 100 100 000 Old_age Always - 0
189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0
190 Airflow_Temperature_Cel 0x0022 065 055 045 Old_age Always - 35 (Min/Max 33/38)
194 Temperature_Celsius 0x0022 035 045 000 Old_age Always - 35 (0 13 0 0 0)
195 Hardware_ECC_Recovered 0x001a 052 041 000 Old_age Always - 87683421
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
SMART Error Log Version: 1
ATA Error Count: 244 (device log contains only the most recent five errors)
CR = Command Register [HEX]
FR = Features Register [HEX]
SC = Sector Count Register [HEX]
SN = Sector Number Register [HEX]
CL = Cylinder Low Register [HEX]
CH = Cylinder High Register [HEX]
DH = Device/Head Register [HEX]
DC = Device Command Register [HEX]
ER = Error register [HEX]
ST = Status register [HEX]
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days.
Error 244 occurred at disk power-on lifetime: 45952 hours (1914 days + 16 hours)
When the command that caused the error occurred, the device was active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 08 ff ff ff 4f 00 03:07:15.069 READ FPDMA QUEUED
ec 00 01 00 00 00 00 00 03:07:15.067 IDENTIFY DEVICE
27 00 00 00 00 00 e0 00 03:07:15.065 READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]
ec 00 00 00 00 00 a0 00 03:07:15.064 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 03:07:15.064 SET FEATURES [Set transfer mode]
Error 243 occurred at disk power-on lifetime: 45952 hours (1914 days + 16 hours)
When the command that caused the error occurred, the device was active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 08 ff ff ff 4f 00 03:07:11.956 READ FPDMA QUEUED
b0 d5 01 09 4f c2 00 00 03:06:53.011 SMART READ LOG
b0 d5 01 06 4f c2 00 00 03:06:52.963 SMART READ LOG
b0 d5 01 01 4f c2 00 00 03:06:52.954 SMART READ LOG
b0 d5 01 00 4f c2 00 00 03:06:52.954 SMART READ LOG
Error 242 occurred at disk power-on lifetime: 45952 hours (1914 days + 16 hours)
When the command that caused the error occurred, the device was active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 08 ff ff ff 4f 00 03:04:27.167 READ FPDMA QUEUED
27 00 00 00 00 00 e0 00 03:04:27.166 READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]
ec 00 00 00 00 00 a0 00 03:04:27.164 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 03:04:27.164 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 03:04:27.163 READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]
Error 241 occurred at disk power-on lifetime: 45952 hours (1914 days + 16 hours)
When the command that caused the error occurred, the device was active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 08 ff ff ff 4f 00 03:04:24.106 READ FPDMA QUEUED
b0 d5 01 09 4f c2 00 00 03:04:03.645 SMART READ LOG
b0 d5 01 06 4f c2 00 00 03:04:03.597 SMART READ LOG
b0 d5 01 01 4f c2 00 00 03:04:03.588 SMART READ LOG
b0 d5 01 00 4f c2 00 00 03:04:03.588 SMART READ LOG
Error 240 occurred at disk power-on lifetime: 45952 hours (1914 days + 16 hours)
When the command that caused the error occurred, the device was active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 08 ff ff ff 4f 00 02:59:16.039 READ FPDMA QUEUED
27 00 00 00 00 00 e0 00 02:59:16.037 READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]
ec 00 00 00 00 00 a0 00 02:59:16.035 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 02:59:16.035 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 02:59:16.034 READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Selective offline Completed without error 00% 45955 -
# 2 Short offline Completed without error 00% 45953 -
# 3 Selective offline Completed: read failure 90% 45953 914942610
# 4 Short offline Completed without error 00% 45953 -
# 5 Selective offline Completed: read failure 90% 45953 914941117
# 6 Short offline Completed without error 00% 45953 -
# 7 Selective offline Completed: read failure 90% 45953 914938130
# 8 Short offline Completed without error 00% 45953 -
# 9 Selective offline Completed: read failure 90% 45953 914936637
#10 Short offline Completed without error 00% 45953 -
#11 Selective offline Completed: read failure 90% 45953 914925917
#12 Short offline Completed without error 00% 45953 -
#13 Selective offline Completed: read failure 90% 45953 914924423
#14 Short offline Completed without error 00% 45953 -
#15 Selective offline Completed: read failure 90% 45953 914916690
#16 Selective offline Completed: read failure 90% 45953 914916690
#17 Short offline Completed without error 00% 45953 -
#18 Selective offline Completed: read failure 90% 45953 914896743
#19 Short offline Completed without error 00% 45953 -
#20 Selective offline Completed: read failure 90% 45953 914895250
#21 Short offline Completed without error 00% 45953 -
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 914940000 1953525167 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
5 Reallocated_Sector_Ct の VALUE が 100 から 082 に低下しており、代替セクタが使われたことを示唆しています。不良セクタの除去は、次のような手順で行いました。
[root@hoge ~]# smartctl -t long /dev/sdd
※(1) long テスト実行
...
[root@hoge ~]# smartctl -a /dev/sdd
※(2) long テストの終了確認（終るまで繰り返し確認）
...
[root@hoge ~]# dd if=/dev/zero of=/dev/sdd bs=4096 seek=$((LBA_of_first_errorの値/8)) count=1
※(3) 不良セクタへのゼロ書き込み
...
[root@hoge ~]# smartctl -t short /dev/sdd
※(4) short テスト実行
...
[root@hoge ~]# smartctl -a /dev/sdd
※(5) short テストの終了確認（終るまで繰り返し確認）
...
[root@hoge ~]# smartctl -t select,LBA_of_first_errorの値-max /dev/sdd
※(6) 不良セクタが発見された位置から続きのテスト（selectモード）を実行
...
[root@hoge ~]# smartctl -a /dev/sdd
※(7) select テストの終了確認（終るまで繰り返し確認）
...
※以降は、LBA_of_first_error が無くなるまで、手順 (3) から (7) まで繰り返し
コツがいくつかありますので以下補足です。手順 (3) で、4096 バイト境界で書き込む必要がありました。表面上は 512n な HDD ですが、もしかしたら本当の物理セクタサイズは 4096 なのかも？（憶測です）。
■関連記事 物理セクタサイズが 4K bytes のディスクで不良セクタが発生した事例と処置
手順 (4) を行わないと、手順 (3) でゼロ書き込みした箇所が正常化されたとみなされないようでした。short テストを行わずに select テストへ進むと、再度同じ LBA が LBA_of_first_error に出てきてしまいます。上の smartctl 出力の紫色の箇所のことです。
手順 (6) の select モードの代わりに、再び long テストでも可ですが、当然セクタゼロ（LBA番号 0）から再検査することになり、所要時間が倍増してしまいます。
2015-07-05追記
その後、２週間経ちましたが、ひとまずは安定した様子で、エラーが出なくなりました。
2015-07-25追記
使用開始してから1ヵ月経ちましたが、その後は ATA bus error が出ることはなく、安定して使えています。細かく見ると、5 Reallocated_Sector_Ct が +1 増えています。
[root@hoge ~]# smartctl -A /dev/sdd smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-229.7.2.el7.x86_64] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 10 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 078 047 044 Pre-fail Always - 72754870 3 Spin_Up_Time 0x0003 099 091 000 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 183 5 Reallocated_Sector_Ct 0x0033 082 082 036 Pre-fail Always - 389 7 Seek_Error_Rate 0x000f 076 060 030 Pre-fail Always - 13042155971 9 Power_On_Hours 0x0032 047 047 000 Old_age Always - 46843 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 037 020 Old_age Always - 136 184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0 187 Reported_Uncorrect 0x0032 001 001 000 Old_age Always - 507 188 Command_Timeout 0x0032 100 100 000 Old_age Always - 0 189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0 190 Airflow_Temperature_Cel 0x0022 065 055 045 Old_age Always - 35 (Min/Max 33/39) 194 Temperature_Celsius 0x0022 035 045 000 Old_age Always - 35 (0 13 0 0 0) 195 Hardware_ECC_Recovered 0x001a 050 041 000 Old_age Always - 72754870 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
2015-08-27追記
使用開始してから2ヵ月経過ですが、その後も ATA bus error が出ることはなく、S.M.A.R.T. の不良セクタ関係のカウンタは、前回（1ヶ月前）から変化なしです。
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