dmesg usb disk error

usb 1-4: USB disconnect, device number 21
sd 27:0:0:0: [sdi] Unhandled error code
sd 27:0:0:0: [sdi]  Result: hostbyte=0x01 driverbyte=0x00
sd 27:0:0:0: [sdi] CDB: cdb[0]=0x2a: 2a 00 03 2f e0 1f 00 00 f0 00
end_request: I/O error, dev sdi, sector 53469215
Buffer I/O error on device sdi1, logical block 6683644
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6683645
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6683646
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6683647
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6683648
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6683649
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6683650
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6683651
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6683652
lost page write due to I/O error on sdi1
sd 27:0:0:0: [sdi] Unhandled error code
sd 27:0:0:0: [sdi]  Result: hostbyte=0x01 driverbyte=0x00
sd 27:0:0:0: [sdi] CDB: cdb[0]=0x2a: 2a 00 03 2f e1 0f 00 00 f0 00
end_request: I/O error, dev sdi, sector 53469455
usb 1-4: new high-speed USB device number 22 using ehci_hcd
usb 1-4: device descriptor read/64, error -71
usb 1-4: device descriptor read/64, error -71
usb 1-4: new high-speed USB device number 23 using ehci_hcd
usb 1-4: device descriptor read/64, error -71
usb 1-4: device descriptor read/64, error -71
usb 1-4: new high-speed USB device number 24 using ehci_hcd
usb 1-4: device not accepting address 24, error -71
usb 1-4: new high-speed USB device number 25 using ehci_hcd
usb 1-4: device not accepting address 25, error -71
hub 1-0:1.0: unable to enumerate USB device on port 4
usb 4-2: new full-speed USB device number 2 using uhci_hcd
usb 4-2: device descriptor read/64, error -71
usb 4-2: device descriptor read/64, error -71
usb 4-2: new full-speed USB device number 3 using uhci_hcd
usb 4-2: device descriptor read/64, error -71
usb 4-2: device descriptor read/64, error -71
usb 4-2: new full-speed USB device number 4 using uhci_hcd
usb 4-2: device not accepting address 4, error -71
usb 4-2: new full-speed USB device number 5 using uhci_hcd
usb 4-2: device not accepting address 5, error -71
hub 4-0:1.0: unable to enumerate USB device on port 2
quiet_error: 37642 callbacks suppressed
Buffer I/O error on device sdi1, logical block 6794313
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794314
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794315
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794316
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794317
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794318
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794319
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794320
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794321
lost page write due to I/O error on sdi1
Buffer I/O error on device sdi1, logical block 6794322
lost page write due to I/O error on sdi1