Co vypíše dmesg ty tři minuty po připojení flash disku?
dmesg vypíše několik stránek, ale ohledně tohoto flash disku (/dev/sdc) a USB je to asi toto:
[ 186.652110] usb 2-4: new high-speed USB device number 2 using ehci_hcd
[ 186.922284] Initializing USB Mass Storage driver...
[ 186.922619] scsi6 : usb-storage 2-4:1.0
[ 186.922795] usbcore: registered new interface driver usb-storage
[ 186.922800] USB Mass Storage support registered.
[ 186.947443] usbcore: registered new interface driver uas
[ 187.923109] scsi 6:0:0:0: Direct-Access Generic Flash Disk 8.00 PQ: 0 ANSI: 2
[ 187.924892] sd 6:0:0:0: Attached scsi generic sg3 type 0
[ 187.927735] sd 6:0:0:0: [sdc] 131072000 512-byte logical blocks: (67.1 GB/62.5 GiB)
[ 187.928405] sd 6:0:0:0: [sdc] Write Protect is off
[ 187.928414] sd 6:0:0:0: [sdc] Mode Sense: 03 00 00 00
[ 187.928966] sd 6:0:0:0: [sdc] No Caching mode page present
[ 187.928975] sd 6:0:0:0: [sdc] Assuming drive cache: write through
[ 187.933586] sd 6:0:0:0: [sdc] No Caching mode page present
[ 187.933597] sd 6:0:0:0: [sdc] Assuming drive cache: write through
[ 187.968632] sdc: unknown partition table
[ 187.973109] sd 6:0:0:0: [sdc] No Caching mode page present
[ 187.973120] sd 6:0:0:0: [sdc] Assuming drive cache: write through
[ 187.973128] sd 6:0:0:0: [sdc] Attached SCSI removable disk
[ 218.960067] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 249.936082] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 280.976079] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 312.016543] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 342.992105] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 360.948107] INFO: task cfdisk:2221 blocked for more than 120 seconds.
[ 360.948116] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 360.948122] cfdisk D ffffffff81806240 0 2221 2220 0x00000000
[ 360.948132] ffff88008db9f908 0000000000000086 0000000000000000 000200da00000000
[ 360.948141] ffff88008db9ffd8 ffff88008db9ffd8 ffff88008db9ffd8 0000000000013780
[ 360.948149] ffffffff81c0d020 ffff8800667bdbc0 ffff88008db9f908 7fffffffffffffff
[ 373.968060] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 374.184261] sd 6:0:0:0: [sdc] Media Changed
[ 374.184270] sd 6:0:0:0: [sdc] Result: hostbyte=DID_ABORT driverbyte=DRIVER_SENSE
[ 374.184279] sd 6:0:0:0: [sdc] Sense Key : Unit Attention [current]
[ 374.184288] Info fld=0x0
[ 374.184291] sd 6:0:0:0: [sdc] Add. Sense: Not ready to ready change, medium may have changed
[ 374.184304] sd 6:0:0:0: [sdc] CDB: Read(10): 28 00 07 cf ff f8 00 00 01 00
[ 374.184320] end_request: I/O error, dev sdc, sector 131071992
[ 374.184329] quiet_error: 36 callbacks suppressed
[ 374.184334] Buffer I/O error on device sdc, logical block 16383999
[ 374.187490] sd 6:0:0:0: [sdc] No Caching mode page present
[ 374.187501] sd 6:0:0:0: [sdc] Assuming drive cache: write through
[ 374.189738] sd 6:0:0:0: [sdc] No Caching mode page present
[ 374.189744] sd 6:0:0:0: [sdc] Assuming drive cache: write through
[ 374.224642] sdc: unknown partition table
[ 404.944040] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 435.984069] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 467.024087] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 498.000087] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 528.976103] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 559.952092] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 560.172310] sd 6:0:0:0: [sdc] Media Changed
[ 560.172319] sd 6:0:0:0: [sdc] Result: hostbyte=DID_ABORT driverbyte=DRIVER_SENSE
[ 560.172327] sd 6:0:0:0: [sdc] Sense Key : Unit Attention [current]
[ 560.172337] Info fld=0x0
[ 560.172340] sd 6:0:0:0: [sdc] Add. Sense: Not ready to ready change, medium may have changed
[ 560.172352] sd 6:0:0:0: [sdc] CDB: Read(10): 28 00 07 cf ff f8 00 00 01 00
[ 560.172369] end_request: I/O error, dev sdc, sector 131071992
[ 560.172377] Buffer I/O error on device sdc, logical block 16383999
[ 560.182844] sd 6:0:0:0: [sdc] No Caching mode page present
[ 560.182857] sd 6:0:0:0: [sdc] Assuming drive cache: write through
[ 560.185172] sd 6:0:0:0: [sdc] No Caching mode page present
[ 560.185177] sd 6:0:0:0: [sdc] Assuming drive cache: write through
[ 560.220212] sdc: unknown partition table
[ 590.928064] usb 2-4: reset high-speed USB device number 2 using ehci_hcd
[ 622.032077] usb 2-4: reset high-speed USB device number 2 using ehci_hcd