Gescheitertes Mount:
[  497.535837] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[  497.535843] ata2.01: failed command: READ DMA EXT
[  497.535849] ata2.01: cmd 25/00:f8:80:35:cd/00:00:1c:00:00/f0 tag 0 dma 126976 in
[  497.535850]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[  497.535854] ata2.01: status: { DRDY ERR }
[  497.535856] ata2.01: error: { UNC }
[  497.591683] ata2.01: configured for UDMA/133
[  497.591713] sd 1:0:1:0: [sdb] Unhandled sense code
[  497.591715] sd 1:0:1:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  497.591719] sd 1:0:1:0: [sdb] Sense Key : Medium Error [current] [descriptor]
[  497.591723] Descriptor sense data with sense descriptors (in hex):
[  497.591726]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
[  497.591735]         1c cd 36 3a 
[  497.591739] sd 1:0:1:0: [sdb] Add. Sense: Unrecovered read error - auto reallocate failed
[  497.591744] sd 1:0:1:0: [sdb] CDB: Read(10): 28 00 1c cd 35 80 00 00 f8 00
[  497.591753] end_request: I/O error, dev sdb, sector 483210810
[  497.591790] ata2: EH complete
[  497.592832] JBD: Failed to read block at offset 12183
[  497.592837] JBD: recovery failed
[  497.592839] EXT4-fs (dm-4): error loading journal

-------------------------

sudo cp /dev/sdb /dev/null
[ 6415.753551] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6415.753557] ata2.01: failed command: READ DMA EXT
[ 6415.753563] ata2.01: cmd 25/00:00:88:35:cd/00:01:1c:00:00/f0 tag 0 dma 131072 in
[ 6415.753564]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6415.753567] ata2.01: status: { DRDY ERR }
[ 6415.753569] ata2.01: error: { UNC }
[ 6415.812387] ata2.01: configured for UDMA/133
[ 6415.812456] ata2: EH complete
[ 6418.143968] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6418.143974] ata2.01: failed command: READ DMA EXT
[ 6418.143980] ata2.01: cmd 25/00:00:88:35:cd/00:01:1c:00:00/f0 tag 0 dma 131072 in
[ 6418.143982]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6418.143985] ata2.01: status: { DRDY ERR }
[ 6418.143987] ata2.01: error: { UNC }
[ 6418.201801] ata2.01: configured for UDMA/133
[ 6418.201872] ata2: EH complete
[ 6420.686540] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6420.686546] ata2.01: failed command: READ DMA EXT
[ 6420.686552] ata2.01: cmd 25/00:00:88:35:cd/00:01:1c:00:00/f0 tag 0 dma 131072 in
[ 6420.686553]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6420.686556] ata2.01: status: { DRDY ERR }
[ 6420.686558] ata2.01: error: { UNC }
[ 6420.742334] ata2.01: configured for UDMA/133
[ 6420.742403] ata2: EH complete
[ 6423.370209] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6423.370213] ata2.01: failed command: READ DMA EXT
[ 6423.370218] ata2.01: cmd 25/00:00:88:35:cd/00:01:1c:00:00/f0 tag 0 dma 131072 in
[ 6423.370219]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6423.370221] ata2.01: status: { DRDY ERR }
[ 6423.370222] ata2.01: error: { UNC }
[ 6423.431050] ata2.01: configured for UDMA/133
[ 6423.431120] ata2: EH complete
[ 6425.760625] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6425.760631] ata2.01: failed command: READ DMA EXT
[ 6425.760637] ata2.01: cmd 25/00:00:88:35:cd/00:01:1c:00:00/f0 tag 0 dma 131072 in
[ 6425.760638]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6425.760641] ata2.01: status: { DRDY ERR }
[ 6425.760643] ata2.01: error: { UNC }
[ 6425.820466] ata2.01: configured for UDMA/133
[ 6425.820533] ata2: EH complete
[ 6428.302177] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6428.302183] ata2.01: failed command: READ DMA EXT
[ 6428.302189] ata2.01: cmd 25/00:00:88:35:cd/00:01:1c:00:00/f0 tag 0 dma 131072 in
[ 6428.302191]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6428.302194] ata2.01: status: { DRDY ERR }
[ 6428.302196] ata2.01: error: { UNC }
[ 6428.362013] ata2.01: configured for UDMA/133
[ 6428.362108] sd 1:0:1:0: [sdb] Unhandled sense code
[ 6428.362110] sd 1:0:1:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 6428.362114] sd 1:0:1:0: [sdb] Sense Key : Medium Error [current] [descriptor]
[ 6428.362118] Descriptor sense data with sense descriptors (in hex):
[ 6428.362121]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
[ 6428.362130]         1c cd 36 3a 
[ 6428.362134] sd 1:0:1:0: [sdb] Add. Sense: Unrecovered read error - auto reallocate failed
[ 6428.362139] sd 1:0:1:0: [sdb] CDB: Read(10): 28 00 1c cd 35 88 00 01 00 00
[ 6428.362148] end_request: I/O error, dev sdb, sector 483210810
[ 6428.362151] __ratelimit: 18 callbacks suppressed
[ 6428.362154] Buffer I/O error on device sdb, logical block 60401351
[ 6428.362159] Buffer I/O error on device sdb, logical block 60401352
[ 6428.362162] Buffer I/O error on device sdb, logical block 60401353
[ 6428.362164] Buffer I/O error on device sdb, logical block 60401354
[ 6428.362167] Buffer I/O error on device sdb, logical block 60401355
[ 6428.362170] Buffer I/O error on device sdb, logical block 60401356
[ 6428.362173] Buffer I/O error on device sdb, logical block 60401357
[ 6428.362176] Buffer I/O error on device sdb, logical block 60401358
[ 6428.362179] Buffer I/O error on device sdb, logical block 60401359
[ 6428.362181] Buffer I/O error on device sdb, logical block 60401360
[ 6428.362191] ata2: EH complete
[ 6430.710460] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6430.710466] ata2.01: failed command: READ DMA EXT
[ 6430.710472] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6430.710474]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6430.710477] ata2.01: status: { DRDY ERR }
[ 6430.710479] ata2.01: error: { UNC }
[ 6430.772414] ata2.01: configured for UDMA/133
[ 6430.772429] ata2: EH complete
[ 6433.101893] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6433.101899] ata2.01: failed command: READ DMA EXT
[ 6433.101905] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6433.101907]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6433.101910] ata2.01: status: { DRDY ERR }
[ 6433.101912] ata2.01: error: { UNC }
[ 6433.161847] ata2.01: configured for UDMA/133
[ 6433.161862] ata2: EH complete
[ 6435.493272] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6435.493277] ata2.01: failed command: READ DMA EXT
[ 6435.493282] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6435.493283]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6435.493285] ata2.01: status: { DRDY ERR }
[ 6435.493287] ata2.01: error: { UNC }
[ 6435.532187] ata2.01: configured for UDMA/133
[ 6435.532204] ata2: EH complete
[ 6438.009797] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6438.009803] ata2.01: failed command: READ DMA EXT
[ 6438.009809] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6438.009810]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6438.009813] ata2.01: status: { DRDY ERR }
[ 6438.009815] ata2.01: error: { UNC }
[ 6438.041700] ata2.01: configured for UDMA/133
[ 6438.041713] ata2: EH complete
[ 6440.518347] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6440.518353] ata2.01: failed command: READ DMA EXT
[ 6440.518359] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6440.518360]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6440.518364] ata2.01: status: { DRDY ERR }
[ 6440.518366] ata2.01: error: { UNC }
[ 6440.585277] ata2.01: configured for UDMA/133
[ 6440.585293] ata2: EH complete
[ 6443.068873] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6443.068878] ata2.01: failed command: READ DMA EXT
[ 6443.068884] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6443.068886]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6443.068889] ata2.01: status: { DRDY ERR }
[ 6443.068891] ata2.01: error: { UNC }
[ 6443.121851] ata2.01: configured for UDMA/133
[ 6443.121868] sd 1:0:1:0: [sdb] Unhandled sense code
[ 6443.121871] sd 1:0:1:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 6443.121874] sd 1:0:1:0: [sdb] Sense Key : Medium Error [current] [descriptor]
[ 6443.121879] Descriptor sense data with sense descriptors (in hex):
[ 6443.121881]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
[ 6443.121891]         1c cd 36 3a 
[ 6443.121895] sd 1:0:1:0: [sdb] Add. Sense: Unrecovered read error - auto reallocate failed
[ 6443.121900] sd 1:0:1:0: [sdb] CDB: Read(10): 28 00 1c cd 36 38 00 00 08 00
[ 6443.121909] end_request: I/O error, dev sdb, sector 483210810
[ 6443.121913] Buffer I/O error on device sdb, logical block 60401351
[ 6443.121931] ata2: EH complete
[ 6445.601430] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6445.601435] ata2.01: failed command: READ DMA EXT
[ 6445.601441] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6445.601442]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6445.601446] ata2.01: status: { DRDY ERR }
[ 6445.601448] ata2.01: error: { UNC }
[ 6445.662359] ata2.01: configured for UDMA/133
[ 6445.662373] ata2: EH complete
[ 6447.992835] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6447.992841] ata2.01: failed command: READ DMA EXT
[ 6447.992847] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6447.992848]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6447.992851] ata2.01: status: { DRDY ERR }
[ 6447.992853] ata2.01: error: { UNC }
[ 6448.051761] ata2.01: configured for UDMA/133
[ 6448.051776] ata2: EH complete
[ 6450.535386] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6450.535392] ata2.01: failed command: READ DMA EXT
[ 6450.535398] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6450.535400]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6450.535403] ata2.01: status: { DRDY ERR }
[ 6450.535405] ata2.01: error: { UNC }
[ 6450.592326] ata2.01: configured for UDMA/133
[ 6450.592341] ata2: EH complete
[ 6453.219066] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6453.219072] ata2.01: failed command: READ DMA EXT
[ 6453.219078] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6453.219079]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6453.219082] ata2.01: status: { DRDY ERR }
[ 6453.219084] ata2.01: error: { UNC }
[ 6453.272011] ata2.01: configured for UDMA/133
[ 6453.272024] ata2: EH complete
[ 6455.751611] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6455.751617] ata2.01: failed command: READ DMA EXT
[ 6455.751623] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6455.751625]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6455.751628] ata2.01: status: { DRDY ERR }
[ 6455.751630] ata2.01: error: { UNC }
[ 6455.813558] ata2.01: configured for UDMA/133
[ 6455.813575] ata2: EH complete
[ 6458.294164] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[ 6458.294169] ata2.01: failed command: READ DMA EXT
[ 6458.294175] ata2.01: cmd 25/00:08:38:36:cd/00:00:1c:00:00/f0 tag 0 dma 4096 in
[ 6458.294177]          res 51/40:00:3a:36:cd/40:00:1c:00:00/f0 Emask 0x9 (media error)
[ 6458.294180] ata2.01: status: { DRDY ERR }
[ 6458.294182] ata2.01: error: { UNC }
[ 6458.352091] ata2.01: configured for UDMA/133
[ 6458.352103] sd 1:0:1:0: [sdb] Unhandled sense code
[ 6458.352106] sd 1:0:1:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 6458.352109] sd 1:0:1:0: [sdb] Sense Key : Medium Error [current] [descriptor]
[ 6458.352114] Descriptor sense data with sense descriptors (in hex):
[ 6458.352116]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
[ 6458.352126]         1c cd 36 3a 
[ 6458.352130] sd 1:0:1:0: [sdb] Add. Sense: Unrecovered read error - auto reallocate failed
[ 6458.352134] sd 1:0:1:0: [sdb] CDB: Read(10): 28 00 1c cd 36 38 00 00 08 00
[ 6458.352143] end_request: I/O error, dev sdb, sector 483210810
[ 6458.352147] Buffer I/O error on device sdb, logical block 60401351
[ 6458.352157] ata2: EH complete