Ubuntu: почему функция "извлечь" на USB флешке оставляет битые файлы

Записываю два фильма на USB флешку через Nautilus, размер каждого ~2 Гб.

Сначала показывается прогресс бар, первые сотни мегабайт записываются практически моментально, потом скорость резко падает. В конце окошко прогрессбара закрывается. Если после этого щелкнуть по значку флешки и выбрать "извлечь", показывается попап "диск был успешно извлечен".

Но обычно второй файл становится битым где-то на середине. Вопрос: почему? Я ожидаю, что ОС скинет буфер ввода-вывода и только после этого разрешит извлечение. Если делать sudo sync, проблемы нет. Если не делать - стабильно повторяется.

PS. Ubuntu 16.04

dmesg

[  656.566475] sd 4:0:0:0: Attached scsi generic sg2 type 0
[  656.567021] sd 4:0:0:0: [sdc] 15730688 512-byte logical blocks: (8.05 GB/7.50 GiB)
[  656.567986] sd 4:0:0:0: [sdc] Write Protect is off
[  656.567989] sd 4:0:0:0: [sdc] Mode Sense: 43 00 00 00
[  656.568893] sd 4:0:0:0: [sdc] No Caching mode page found
[  656.568899] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[  656.573524]  sdc: sdc1
[  656.576879] sd 4:0:0:0: [sdc] Attached SCSI removable disk
[  666.791088] usb 2-1.2: USB disconnect, device number 4
[  669.984170] usb 2-1.2: new high-speed USB device number 5 using ehci-pci
[  670.095071] usb 2-1.2: New USB device found, idVendor=090c, idProduct=1000, bcdDevice=11.00
[  670.095074] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  670.095076] usb 2-1.2: Product: Silicon-Power
[  670.095078] usb 2-1.2: Manufacturer: UFD 2.0
[  670.095079] usb 2-1.2: SerialNumber: 1402036101500139
[  670.095498] usb-storage 2-1.2:1.0: USB Mass Storage device detected
[  670.095862] scsi host4: usb-storage 2-1.2:1.0
[  671.506618] scsi 4:0:0:0: Direct-Access     UFD 2.0  Silicon-Power8G  1100 PQ: 0 ANSI: 0 CCS
[  671.507034] sd 4:0:0:0: Attached scsi generic sg2 type 0
[  671.507690] sd 4:0:0:0: [sdc] 15730688 512-byte logical blocks: (8.05 GB/7.50 GiB)
[  671.508541] sd 4:0:0:0: [sdc] Write Protect is off
[  671.508545] sd 4:0:0:0: [sdc] Mode Sense: 43 00 00 00
[  671.509438] sd 4:0:0:0: [sdc] No Caching mode page found
[  671.509446] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[  671.515803]  sdc: sdc1
[  671.519015] sd 4:0:0:0: [sdc] Attached SCSI removable disk
[  699.075190] sd 4:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  699.075192] sd 4:0:0:0: [sdc] tag#0 Sense Key : Not Ready [current] 
[  699.075194] sd 4:0:0:0: [sdc] tag#0 Add. Sense: Medium not present
[  699.075196] sd 4:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 00 00 58 00 00 18 00
[  699.075198] blk_update_request: I/O error, dev sdc, sector 88 op 0x0:(READ) flags 0x80700 phys_seg 3 prio class 0
[  699.076443] sd 4:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  699.076444] sd 4:0:0:0: [sdc] tag#0 Sense Key : Not Ready [current] 
[  699.076446] sd 4:0:0:0: [sdc] tag#0 Add. Sense: Medium not present
[  699.076448] sd 4:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 00 00 78 00 00 38 00
[  699.076450] blk_update_request: I/O error, dev sdc, sector 120 op 0x0:(READ) flags 0x80700 phys_seg 7 prio class 0
[  699.078317] sd 4:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  699.078320] sd 4:0:0:0: [sdc] tag#0 Sense Key : Not Ready [current] 
[  699.078322] sd 4:0:0:0: [sdc] tag#0 Add. Sense: Medium not present
[  699.078323] sd 4:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 00 00 b8 00 00 90 00
[  699.078325] blk_update_request: I/O error, dev sdc, sector 184 op 0x0:(READ) flags 0x80700 phys_seg 18 prio class 0
[  699.079568] sd 4:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  699.079571] sd 4:0:0:0: [sdc] tag#0 Sense Key : Not Ready [current] 
[  699.079574] sd 4:0:0:0: [sdc] tag#0 Add. Sense: Medium not present
[  699.079576] sd 4:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 00 00 58 00 00 08 00
[  699.079579] blk_update_request: I/O error, dev sdc, sector 88 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[  699.079582] Buffer I/O error on dev sdc1, logical block 4, async page read
[  699.080831] sd 4:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  699.080832] sd 4:0:0:0: [sdc] tag#0 Sense Key : Not Ready [current] 
[  699.080834] sd 4:0:0:0: [sdc] tag#0 Add. Sense: Medium not present
[  699.080835] sd 4:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 00 00 b8 00 00 08 00
[  699.080837] blk_update_request: I/O error, dev sdc, sector 184 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[  699.080839] Buffer I/O error on dev sdc1, logical block 16, async page read
[  864.278331] usb 2-1.2: USB disconnect, device number 5
[ 4505.817188] usb 2-1.2: new high-speed USB device number 6 using ehci-pci
[ 4505.927791] usb 2-1.2: New USB device found, idVendor=090c, idProduct=1000, bcdDevice=11.00
[ 4505.927795] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 4505.927797] usb 2-1.2: Product: Silicon-Power
[ 4505.927798] usb 2-1.2: Manufacturer: UFD 2.0
[ 4505.927800] usb 2-1.2: SerialNumber: 1402036101500139
[ 4505.928229] usb-storage 2-1.2:1.0: USB Mass Storage device detected
[ 4505.928574] scsi host4: usb-storage 2-1.2:1.0
[ 4507.418940] scsi 4:0:0:0: Direct-Access     UFD 2.0  Silicon-Power8G  1100 PQ: 0 ANSI: 0 CCS
[ 4507.419397] sd 4:0:0:0: Attached scsi generic sg2 type 0
[ 4507.420173] sd 4:0:0:0: [sdc] 15730688 512-byte logical blocks: (8.05 GB/7.50 GiB)
[ 4507.420999] sd 4:0:0:0: [sdc] Write Protect is off
[ 4507.421002] sd 4:0:0:0: [sdc] Mode Sense: 43 00 00 00
[ 4507.421896] sd 4:0:0:0: [sdc] No Caching mode page found
[ 4507.421904] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[ 4507.428405]  sdc: sdc1
[ 4507.431647] sd 4:0:0:0: [sdc] Attached SCSI removable disk
[ 5421.829958] sd 4:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 5421.829961] sd 4:0:0:0: [sdc] tag#0 Sense Key : Not Ready [current] 
[ 5421.829963] sd 4:0:0:0: [sdc] tag#0 Add. Sense: Medium not present
[ 5421.829966] sd 4:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 78 04 18 00 00 08 00
[ 5421.829969] blk_update_request: I/O error, dev sdc, sector 7865368 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[ 5421.831829] sd 4:0:0:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 5421.831832] sd 4:0:0:0: [sdc] tag#0 Sense Key : Not Ready [current] 
[ 5421.831834] sd 4:0:0:0: [sdc] tag#0 Add. Sense: Medium not present
[ 5421.831837] sd 4:0:0:0: [sdc] tag#0 CDB: Read(10) 28 00 00 78 04 18 00 00 08 00
[ 5421.831839] blk_update_request: I/O error, dev sdc, sector 7865368 op 0x0:(READ) flags 0x0 phys_seg 8 prio class 0
[ 5421.831843] Buffer I/O error on dev sdc1, logical block 7865312, async page read
[ 5421.831845] Buffer I/O error on dev sdc1, logical block 7865313, async page read
[ 5421.831847] Buffer I/O error on dev sdc1, logical block 7865314, async page read
[ 5421.831849] Buffer I/O error on dev sdc1, logical block 7865315, async page read
[ 5421.831850] Buffer I/O error on dev sdc1, logical block 7865316, async page read
[ 5421.831852] Buffer I/O error on dev sdc1, logical block 7865317, async page read
[ 5421.831853] Buffer I/O error on dev sdc1, logical block 7865318, async page read
[ 5421.831855] Buffer I/O error on dev sdc1, logical block 7865319, async page read
[ 5429.178684] usb 2-1.2: USB disconnect, device number 6
[ 5431.780821] usb 2-1.2: new high-speed USB device number 7 using ehci-pci
[ 5431.891402] usb 2-1.2: New USB device found, idVendor=090c, idProduct=1000, bcdDevice=11.00
[ 5431.891405] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 5431.891407] usb 2-1.2: Product: Silicon-Power
[ 5431.891408] usb 2-1.2: Manufacturer: UFD 2.0
[ 5431.891410] usb 2-1.2: SerialNumber: 1402036101500139
[ 5431.891867] usb-storage 2-1.2:1.0: USB Mass Storage device detected
[ 5431.892187] scsi host4: usb-storage 2-1.2:1.0
[ 5433.361870] scsi 4:0:0:0: Direct-Access     UFD 2.0  Silicon-Power8G  1100 PQ: 0 ANSI: 0 CCS
[ 5433.362263] sd 4:0:0:0: Attached scsi generic sg2 type 0
[ 5433.363053] sd 4:0:0:0: [sdc] 15730688 512-byte logical blocks: (8.05 GB/7.50 GiB)
[ 5433.363954] sd 4:0:0:0: [sdc] Write Protect is off
[ 5433.363958] sd 4:0:0:0: [sdc] Mode Sense: 43 00 00 00
[ 5433.364903] sd 4:0:0:0: [sdc] No Caching mode page found
[ 5433.364921] sd 4:0:0:0: [sdc] Assuming drive cache: write through
[ 5433.369906]  sdc: sdc1
[ 5433.373265] sd 4:0:0:0: [sdc] Attached SCSI removable disk

mtab:

/dev/sdc1 /media/hostel/2571E5907D95FE34 fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096 0 0