one partition just went missing; nothing wrong with others

i just had a hdd failure (well, at least partiton failure). i am using arch linux.

Code:: $ uname -a Linux 3.4.9-1-ARCH #1 SMP PREEMPT Wed Aug 15 18:59:31 CEST 2012 x86_64 GNU/Linux

the hard drive is 1tb usb 3.0 wd externel drive (sdc). hd was already plugged in, its first partition (i.e. sdc1,ext4) mounted when the problem happened. i was working, nothing that io to sdc1. then i realized sdc1 is no longer mounted. i tried to mount it,but the command took at least 1m untill i ^C it. there is no uuid entry in /dev/disk/by-uuid/

partition list:

Code:: $ fdisk -l /dev/sdc /dev/sdc1 2048 1843202047 921600000 83 Linux /dev/sdc2 1943218176 1953458175 5120000 83 Linux /dev/sdc3 1843202048 1943218175 50008064 7 HPFS/NTFS/exFAT

i tried to back up it using dd, but that failed too.

Code:: $ dd if=/dev/sdc1 > /mnt/sg/fs dd: reading '/dev/sdc1': Input/output error 0+0 records in 0+0 records out 0 bytes (0 B) copied, 5.56793 s, 0.0 kB/s

i am not sure that it got locked, because every other partions is working.

syslog:

Code:: Nov 5 01:08:44 localhost kernel: [18427.158620] sd 17:0:0:0: [sdc] Unhandled sense code Nov 5 01:08:44 localhost kernel: [18427.158627] sd 17:0:0:0: [sdc] Result: hostbyte=0x00 driverbyte=0x08 Nov 5 01:08:44 localhost kernel: [18427.158632] sd 17:0:0:0: [sdc] Sense Key : 0x3 [current] Nov 5 01:08:44 localhost kernel: [18427.158638] sd 17:0:0:0: [sdc] ASC=0x11 ASCQ=0x0 Nov 5 01:08:44 localhost kernel: [18427.158643] sd 17:0:0:0: [sdc] CDB: cdb[0]=0x28: 28 00 00 00 08 00 00 00 08 00

smart info

Code:: smartctl 6.0 2012-10-10 r3643 [x86_64-linux-3.4.9-1-ARCH] (local build) Copyright (C) 2002-12, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Model Family: Western Digital My Passport (USB, AF) Device Model: WDC WD10TMVW-11ZSMS4 Serial Number: xxxx LU WWN Device Id: xxxx Firmware Version: 01.01A01 User Capacity: 1,000,204,886,016 bytes [1.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 5200 rpm Device is: In smartctl database [for details use: -P show] ATA Version is: ATA8-ACS (minor revision not indicated) SATA Version is: SATA 2.6, 3.0 Gb/s (current: 3.0 Gb/s) Local Time is: Mon Nov 5 22:09:45 2012 IST SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART STATUS RETURN: incomplete response, ATA output registers missing SMART overall-health self-assessment test result: PASSED Warning: This result is based on an Attribute check. General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. 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: (26460) 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: ( 257) minutes. Conveyance self-test routine recommended polling time: ( 5) minutes. SCT capabilities: (0x7035) SCT Status 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 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0027 167 162 021 Pre-fail Always - 4608 4 Start_Stop_Count 0x0032 099 099 000 Old_age Always - 1054 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 098 098 000 Old_age Always - 1494 10 Spin_Retry_Count 0x0032 100 100 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 574 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 406 193 Load_Cycle_Count 0x0032 195 195 000 Old_age Always - 17202 194 Temperature_Celsius 0x0022 119 100 000 Old_age Always - 31 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 1 198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed: read failure 90% 1492 2048 # 2 Short offline Completed: read failure 90% 1492 2048 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.

i ran testdisk too. here is testdisk.log, orignally of 560mb , what you see here is first and last 100 lines

Code:: Using locale 'C'. Mon Nov 5 16:47:45 2012 Command line: TestDisk /log /debug /dev/sdc TestDisk 6.13, Data Recovery Utility, November 2011 Christophe GRENIER <grenier@cgsecurity.org> http://www.cgsecurity.org OS: Linux, kernel 3.4.9-1-ARCH (#1 SMP PREEMPT Wed Aug 15 18:59:31 CEST 2012) x86_64 Compiler: GCC 4.6 Compilation date: 2012-02-08T22:31:53 ext2fs lib: 1.42.5, ntfs lib: libntfs-3g, reiserfs lib: 0.3.0.5, ewf lib: none Hard disk list Disk /dev/sdc - 1000 GB / 931 GiB - CHS 121597 255 63, sector size=512 - WD My Passport 0740, FW:1003 Partition table type (auto): Intel Disk /dev/sdc - 1000 GB / 931 GiB - WD My Passport 0740 Partition table type: Intel Analyse Disk /dev/sdc - 1000 GB / 931 GiB - CHS 121597 255 63 Geometry from i386 MBR: head=255 sector=63 file_pread(3,16,buffer,2051(0/32/36)) read err: Input/output error file_pread(3,1,buffer,2048(0/32/33)) read err: Input/output error check_part_i386 failed for partition type 83 NTFS at 114734/5/24 Current partition structure: No ext2, JFS, Reiser, cramfs or XFS marker 1 P Linux 0 32 33 114734 5 23 1843200000 1 P Linux 0 32 33 114734 5 23 1843200000 2 P Linux 120959 187 61 121597 37 40 10240000 [arch_wd] 3 P HPFS - NTFS 114734 5 24 120959 187 60 100016128 [temp] No partition is bootable Computes LBA from CHS for Disk /dev/sdc - 1000 GB / 931 GiB - CHS 121598 255 63 Allow partial last cylinder : Yes search_vista_part: 1 search_part() Disk /dev/sdc - 1000 GB / 931 GiB - CHS 121598 255 63 file_pread(3,16,buffer,2048(0/32/33)) read err: Input/output error file_pread(3,1,buffer,2048(0/32/33)) read err: Input/output error Linux 130 170 41 130 203 17 2056 LUKS 1 (Data size unknown), 1052 KB / 1028 KiB file_pread(3,16,buffer,5615632(349/142/2)) read err: Partial read file_pread(3,16,buffer,5615679(349/142/49)) read err: Input/output error file_pread(3,1,buffer,5615679(349/142/49)) read err: Input/output error file_pread(3,8,buffer,5615695(349/143/2)) read err: Input/output error file_pread(3,11,buffer,5615742(349/143/49)) read err: Input/output error file_pread(3,2,buffer,5617664(349/174/18)) read err: Input/output error file_pread(3,6,buffer,5617666(349/174/20)) read err: Input/output error file_pread(3,8,buffer,5617672(349/174/26)) read err: Input/output error file_pread(3,3,buffer,5617680(349/174/34)) read err: Input/output error file_pread(3,3,buffer,5617727(349/175/18)) read err: Input/output error file_pread(3,8,buffer,5617743(349/175/34)) read err: Input/output error file_pread(3,11,buffer,5617790(349/176/18)) read err: Input/output error file_pread(3,2,buffer,5619712(349/206/50)) read err: Input/output error file_pread(3,6,buffer,5619714(349/206/52)) read err: Input/output error file_pread(3,8,buffer,5619720(349/206/58)) read err: Input/output error file_pread(3,3,buffer,5619728(349/207/3)) read err: Input/output error file_pread(3,3,buffer,5619775(349/207/50)) read err: Input/output error file_pread(3,8,buffer,5619791(349/208/3)) read err: Input/output error file_pread(3,11,buffer,5619838(349/208/50)) read err: Input/output error file_pread(3,2,buffer,5621760(349/239/19)) read err: Input/output error file_pread(3,6,buffer,5621762(349/239/21)) read err: Input/output error file_pread(3,8,buffer,5621768(349/239/27)) read err: Input/output error file_pread(3,3,buffer,5621776(349/239/35)) read err: Input/output error file_pread(3,3,buffer,5621823(349/240/19)) read err: Input/output error file_pread(3,8,buffer,5621839(349/240/35)) read err: Input/output error file_pread(3,11,buffer,5621886(349/241/19)) read err: Input/output error file_pread(3,2,buffer,5623808(350/16/51)) read err: Input/output error file_pread(3,8,buffer,5622750(350/0/1)) read err: Input/output error file_pread(3,8,buffer,5622758(350/0/9)) read err: Input/output error file_pread(3,3,buffer,5622766(350/0/17)) read err: Input/output error file_pread(3,3,buffer,5622813(350/1/1)) read err: Input/output error file_pread(3,8,buffer,5622829(350/1/17)) read err: Input/output error file_pread(3,11,buffer,5622876(350/2/1)) read err: Input/output error file_pread(3,2,buffer,5624798(350/32/33)) read err: Input/output error file_pread(3,5,buffer,5622816(350/1/4)) read err: Input/output error file_pread(3,8,buffer,5622821(350/1/9)) read err: Input/output error file_pread(3,8,buffer,5622892(350/2/17)) read err: Input/output error file_pread(3,11,buffer,5622939(350/3/1)) read err: Input/output error file_pread(3,2,buffer,5624861(350/33/33)) read err: Input/output error file_pread(3,6,buffer,5623810(350/16/53)) read err: Input/output error file_pread(3,8,buffer,5623816(350/16/59)) read err: Input/output error file_pread(3,3,buffer,5623824(350/17/4)) read err: Input/output error file_pread(3,3,buffer,5623871(350/17/51)) read err: Input/output error file_pread(3,8,buffer,5623887(350/18/4)) read err: Input/output error file_pread(3,11,buffer,5623934(350/18/51)) read err: Input/output error file_pread(3,2,buffer,5625856(350/49/20)) read err: Input/output error file_pread(3,6,buffer,5625858(350/49/22)) read err: Input/output error file_pread(3,8,buffer,5625864(350/49/28)) read err: Input/output error file_pread(3,3,buffer,5625872(350/49/36)) read err: Input/output error file_pread(3,3,buffer,5625919(350/50/20)) read err: Input/output error file_pread(3,8,buffer,5625935(350/50/36)) read err: Input/output error file_pread(3,11,buffer,5625982(350/51/20)) read err: Input/output error file_pread(3,2,buffer,5627904(350/81/52)) read err: Input/output error file_pread(3,6,buffer,5627906(350/81/54)) read err: Input/output error file_pread(3,8,buffer,5627912(350/81/60)) read err: Input/output error file_pread(3,3,buffer,5627920(350/82/5)) read err: Input/output error . . . file_pread(3,11,buffer,1953439866(121596/2/1)) read err: Input/output error file_pread(3,2,buffer,1953441788(121596/32/33)) read err: Input/output error file_pread(3,1,buffer,1953439759(121596/0/20)) read err: Input/output error file_pread(3,3,buffer,1953439760(121596/0/21)) read err: Input/output error file_pread(3,3,buffer,1953439807(121596/1/5)) read err: Input/output error file_pread(3,4,buffer,1953439827(121596/1/25)) read err: Input/output error file_pread(3,4,buffer,1953439877(121596/2/12)) read err: Input/output error file_pread(3,2,buffer,1953441792(121596/32/37)) read err: Input/output error file_pread(3,5,buffer,1953439806(121596/1/4)) read err: Input/output error file_pread(3,8,buffer,1953439811(121596/1/9)) read err: Input/output error file_pread(3,8,buffer,1953439882(121596/2/17)) read err: Input/output error file_pread(3,11,buffer,1953439929(121596/3/1)) read err: Input/output error file_pread(3,2,buffer,1953441851(121596/33/33)) read err: Input/output error file_pread(3,6,buffer,1953441794(121596/32/39)) read err: Input/output error file_pread(3,8,buffer,1953441800(121596/32/45)) read err: Input/output error file_pread(3,3,buffer,1953441808(121596/32/53)) read err: Input/output error file_pread(3,3,buffer,1953441855(121596/33/37)) read err: Input/output error file_pread(3,8,buffer,1953441871(121596/33/53)) read err: Input/output error file_pread(3,11,buffer,1953441918(121596/34/37)) read err: Input/output error file_pread(3,2,buffer,1953443840(121596/65/6)) read err: Input/output error file_pread(3,6,buffer,1953443842(121596/65/8)) read err: Input/output error file_pread(3,8,buffer,1953443848(121596/65/14)) read err: Input/output error file_pread(3,3,buffer,1953443856(121596/65/22)) read err: Input/output error file_pread(3,3,buffer,1953443903(121596/66/6)) read err: Input/output error file_pread(3,8,buffer,1953443919(121596/66/22)) read err: Input/output error file_pread(3,11,buffer,1953443966(121596/67/6)) read err: Input/output error file_pread(3,2,buffer,1953445888(121596/97/38)) read err: Input/output error file_pread(3,6,buffer,1953445890(121596/97/40)) read err: Input/output error file_pread(3,8,buffer,1953445896(121596/97/46)) read err: Input/output error file_pread(3,3,buffer,1953445904(121596/97/54)) read err: Input/output error file_pread(3,3,buffer,1953445951(121596/98/38)) read err: Input/output error file_pread(3,8,buffer,1953445967(121596/98/54)) read err: Input/output error file_pread(3,11,buffer,1953446014(121596/99/38)) read err: Input/output error file_pread(3,2,buffer,1953447936(121596/130/7)) read err: Input/output error file_pread(3,6,buffer,1953447938(121596/130/9)) read err: Input/output error file_pread(3,8,buffer,1953447944(121596/130/15)) read err: Input/output error file_pread(3,3,buffer,1953447952(121596/130/23)) read err: Input/output error file_pread(3,3,buffer,1953447999(121596/131/7)) read err: Input/output error file_pread(3,8,buffer,1953448015(121596/131/23)) read err: Input/output error file_pread(3,11,buffer,1953448062(121596/132/7)) read err: Input/output error file_pread(3,2,buffer,1953449984(121596/162/39)) read err: Input/output error file_pread(3,6,buffer,1953449986(121596/162/41)) read err: Input/output error file_pread(3,8,buffer,1953449992(121596/162/47)) read err: Input/output error file_pread(3,3,buffer,1953450000(121596/162/55)) read err: Input/output error file_pread(3,3,buffer,1953450047(121596/163/39)) read err: Input/output error file_pread(3,8,buffer,1953450063(121596/163/55)) read err: Input/output error file_pread(3,11,buffer,1953450110(121596/164/39)) read err: Input/output error file_pread(3,2,buffer,1953452032(121596/195/8)) read err: Input/output error file_pread(3,6,buffer,1953452034(121596/195/10)) read err: Input/output error file_pread(3,8,buffer,1953452040(121596/195/16)) read err: Input/output error file_pread(3,3,buffer,1953452048(121596/195/24)) read err: Input/output error file_pread(3,3,buffer,1953452095(121596/196/8)) read err: Input/output error file_pread(3,8,buffer,1953452111(121596/196/24)) read err: Input/output error file_pread(3,11,buffer,1953452158(121596/197/8)) read err: Input/output error file_pread(3,2,buffer,1953454080(121596/227/40)) read err: Input/output error file_pread(3,6,buffer,1953454082(121596/227/42)) read err: Input/output error file_pread(3,8,buffer,1953454088(121596/227/48)) read err: Input/output error file_pread(3,3,buffer,1953454096(121596/227/56)) read err: Input/output error file_pread(3,3,buffer,1953454143(121596/228/40)) read err: Input/output error file_pread(3,8,buffer,1953454159(121596/228/56)) read err: Input/output error file_pread(3,11,buffer,1953454206(121596/229/40)) read err: Input/output error file_pread(3,2,buffer,1953456128(121597/5/9)) read err: Input/output error file_pread(3,8,buffer,1953455805(121597/0/1)) read err: Input/output error file_pread(3,8,buffer,1953455813(121597/0/9)) read err: Input/output error file_pread(3,3,buffer,1953455821(121597/0/17)) read err: Input/output error file_pread(3,3,buffer,1953455868(121597/1/1)) read err: Input/output error file_pread(3,8,buffer,1953455884(121597/1/17)) read err: Input/output error file_pread(3,11,buffer,1953455931(121597/2/1)) read err: Input/output error file_pread(3,2,buffer,1953457853(121597/32/33)) read err: Input/output error file_pread(3,5,buffer,1953455871(121597/1/4)) read err: Input/output error file_pread(3,8,buffer,1953455876(121597/1/9)) read err: Input/output error file_pread(3,8,buffer,1953455947(121597/2/17)) read err: Input/output error file_pread(3,11,buffer,1953455994(121597/3/1)) read err: Input/output error file_pread(3,2,buffer,1953457916(121597/33/33)) read err: Input/output error file_pread(3,6,buffer,1953456130(121597/5/11)) read err: Input/output error file_pread(3,8,buffer,1953456136(121597/5/17)) read err: Input/output error file_pread(3,3,buffer,1953456144(121597/5/25)) read err: Input/output error file_pread(3,3,buffer,1953456191(121597/6/9)) read err: Input/output error file_pread(3,8,buffer,1953456207(121597/6/25)) read err: Input/output error file_pread(3,11,buffer,1953456254(121597/7/9)) read err: Input/output error Results L Linux 130 170 41 130 254 63 5315 LUKS 1 (Data size unknown), 2721 KB / 2657 KiB interface_write() 1 E extended 130 170 1 130 254 63 5355 5 L Linux 130 170 41 130 254 63 5315 simulate write! write_mbr_i386: starting... file_pread(3,1,buffer,0(0/0/1)) read err: Input/output error Partition: Read error Store new MBR code write_all_log_i386: starting... write_all_log_i386: CHS: 130/170/1,lba=2099160 file_pread(3,1,buffer,2099160(130/170/1)) read err: Input/output error TestDisk exited normally.

the topic is also being followed at linuxquestion https://www.linuxquestions.org/question ... ?p=4822153

any help is appriciated .
thanks

There is some contradiction between the drive's view of the problem (only 1 logged unreadable sector - SMART attribute 197 raw value) and the various Linux I/O error messages which refer to many other parts of the disk.

The "obvious" unreadable sector is LBA 2048 which is the first sector in /dev/sdc1 and that is why your dd attempt failed immediately. The other I/O errors reported by Linux could be due to poor I/O error handling by Linux drivers, or the behaviour of the USB-SATA bridge (these often have error handling issues), or something else which should preferably be diagnosed by someone who has the drive in front of him. Either way, that contradiction in reported errors exists, so the real situation is not completely clear. However - do NOT try to run fsck or similar, on any disk with unreadable sectors, like yours. It can make things much worse.

There are a few different possible DIY approaches, but as with any DIY, they have risks, especially for the inexperienced. I believe that WD enclosure (and in your case therefore probably the drive's PCB itself) has "Smartware" built-in encryption, so it's likely that you can't avoid using the USB interface for any attempted DIY recovery.

If the data is valuable (i.e. you don't want to risk it), I suggest that the services of a DR company experienced with these WD drives, would be worth you considering. However if you prefer to take risks, and are prepared to accept the consequences of your actions, then search the forum for discussions about cloning (if you're comfortable with Linux then read about GNU ddrescue, for example), for which you'll need (at least) another 1TB of unused disk space (personally I would use 2 x 1TB disks in a specific technique in this situation to try to minimise risks, but some people accuse me of being over-cautious and spending more on temporary disks than is necessary

). Do lots of research first, to reduce your chances of making a mistake. That cloning process (if it completes) will also confirm how many user LBAs are unreadable using normal techniques, as part of the cloning process.

If you're lucky, then recovery from the readable clone can then be attempted. If you're unlucky and the disk deteriorates during cloning (or if you make a catastrophic mistake), then the recovery becomes much harder or impossible.

As always, remote diagnosis accuracy is limited and the results often incomplete, but these comments are an overview of how I see your situation, based on my interpretation of the information supplied. Others may interpret your comments differently and offer alternative views. Ultimately it's your data; your risk; your choice.

one partition just went missing; nothing wrong with others

one partition just went missing; nothing wrong with others

Re: one partition just went missing; nothing wrong with othe