我有一个来自佳能 SX40 的 16GB 金士顿 SDHC，它似乎已损坏或出现硬件故障。
相机仅显示一些照片和视频（相机表示无法读取某些内容）。但我想要/需要从那里获取更多照片（我母亲和她现在住得很远的朋友的生日）。
当我将 SD 连接到读卡器时，文件资源管理器 (Caja) 会自动打开，几秒钟后会关闭。在那几秒钟内，我什至可以双击 DCMI 文件夹并可以看到里面的内容......但什么也没有。
在那几秒钟内，/sdb1 出现在 /dev 中，但随后就消失了。 Gparted 和 Photorec 都无法读取它。另外， dd 无法从 sdb 读取，它说：
$ sudo dd if=/dev/sdb of=tarjeta.img bs=512
dd: No se puede abrir '/dev/sdb': No se ha encontrado el medio
另一种尝试：
$ sudo ddrescue -dr3 /dev/sdb card.image logfile
ddrescue: Can't open input file: No medium found
再次尝试 ddrescue，这一次，在“那几秒钟”......直到它消失：
$ sudo ddrescue -dr3 /dev/sdb card.image logfile
GNU ddrescue 1.24
Press Ctrl-C to interrupt
ipos: 10747 kB, non-trimmed: 78708 kB, current rate: 0 B/s
opos: 10747 kB, non-scraped: 0 B, average rate: 2149 kB/s
non-tried: 0 B, bad-sector: 0 B, error rate: 85393 kB/s
rescued: 10747 kB, bad areas: 0, run time: 4s
pct rescued: 0.06%, read errors: 1402, remaining time: n/a
time since last successful read: 0s
Trimming failed blocks... (forwards)
ddrescue: Unaligned read error. Is sector size correct?
这是插入卡时的 dmseg：
[67030.250419] sd 6:0:0:0: [sdb] 31047680 512-byte logical blocks: (15.9 GB/14.8 GiB)
[67030.252183] sd 6:0:0:0: [sdb] Write Protect is off
[67030.252188] sd 6:0:0:0: [sdb] Mode Sense: 4b 00 00 08
[67030.258544] sdb: sdb1
[67030.956050] FAT-fs (sdb1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[67035.709902] scsi_io_completion: 119 callbacks suppressed
[67035.709908] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67035.709911] sd 6:0:0:0: [sdb] tag#0 Sense Key : Illegal Request [current]
[67035.709914] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Logical block address out of range
[67035.709917] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 41 00 00 01 00
[67035.709918] blk_update_request: 119 callbacks suppressed
[67035.709920] blk_update_request: critical target error, dev sdb, sector 25782849
[67035.846388] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67035.846391] sd 6:0:0:0: [sdb] tag#0 Sense Key : Illegal Request [current]
[67035.846394] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Logical block address out of range
[67035.846397] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 42 00 00 01 00
[67035.846400] blk_update_request: critical target error, dev sdb, sector 25782850
[67035.982878] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67035.982883] sd 6:0:0:0: [sdb] tag#0 Sense Key : Illegal Request [current]
[67035.982886] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Logical block address out of range
[67035.982890] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 43 00 00 01 00
[67035.982893] blk_update_request: critical target error, dev sdb, sector 25782851
[67036.119373] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67036.119377] sd 6:0:0:0: [sdb] tag#0 Sense Key : Illegal Request [current]
[67036.119380] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Logical block address out of range
[67036.119383] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 44 00 00 01 00
[67036.119385] blk_update_request: critical target error, dev sdb, sector 25782852
[67036.277084] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67036.277088] sd 6:0:0:0: [sdb] tag#0 Sense Key : Illegal Request [current]
[67036.277092] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Logical block address out of range
[67036.277096] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 45 00 00 01 00
[67036.277098] blk_update_request: critical target error, dev sdb, sector 25782853
[67036.278149] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67036.278153] sd 6:0:0:0: [sdb] tag#0 Sense Key : Not Ready [current]
[67036.278156] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Medium not present
[67036.278159] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 46 00 00 01 00
[67036.278162] blk_update_request: I/O error, dev sdb, sector 25782854
[67036.279195] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67036.279197] sd 6:0:0:0: [sdb] tag#0 Sense Key : Not Ready [current]
[67036.279200] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Medium not present
[67036.279203] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 47 00 00 02 00
[67036.279205] blk_update_request: I/O error, dev sdb, sector 25782855
[67036.280326] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67036.280330] sd 6:0:0:0: [sdb] tag#0 Sense Key : Not Ready [current]
[67036.280333] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Medium not present
[67036.280336] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 48 00 00 01 00
[67036.280338] blk_update_request: I/O error, dev sdb, sector 25782856
[67036.281448] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67036.281451] sd 6:0:0:0: [sdb] tag#0 Sense Key : Not Ready [current]
[67036.281454] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Medium not present
[67036.281457] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 49 00 00 01 00
[67036.281459] blk_update_request: I/O error, dev sdb, sector 25782857
[67036.282445] sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[67036.282448] sd 6:0:0:0: [sdb] tag#0 Sense Key : Not Ready [current]
[67036.282451] sd 6:0:0:0: [sdb] tag#0 Add. Sense: Medium not present
[67036.282454] sd 6:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 01 89 6a 4a 00 00 01 00
[67036.282456] blk_update_request: I/O error, dev sdb, sector 25782858
[67036.341825] FAT-fs (sdb1): Directory bread(block 25774657) failed
[67036.342819] FAT-fs (sdb1): Directory bread(block 25774658) failed
[67036.344750] FAT-fs (sdb1): Directory bread(block 25774659) failed
[67036.345900] FAT-fs (sdb1): Directory bread(block 25774660) failed
[67036.346943] FAT-fs (sdb1): Directory bread(block 25774661) failed
[67036.348077] FAT-fs (sdb1): Directory bread(block 25774662) failed
[67036.349069] FAT-fs (sdb1): Directory bread(block 25774663) failed
[67036.350169] FAT-fs (sdb1): Directory bread(block 25774664) failed
[67036.351453] FAT-fs (sdb1): Directory bread(block 25774665) failed
[67036.352443] FAT-fs (sdb1): Directory bread(block 25774666) failed
[67036.409693] FAT-fs (sdb1): error, corrupted directory (invalid entries)
[67036.409699] FAT-fs (sdb1): Filesystem has been set read-only
[67036.443807] Buffer I/O error on dev sdb1, logical block 3759, lost async page write
[67036.471054] Buffer I/O error on dev sdb1, logical block 7548, lost async page write
[67037.040148] VFS: Dirty inode writeback failed for block device sdb1 (err=-5).
我还可以尝试从其中获取图像/视频吗？
操作系统：Debian Stretch x64 Mate。