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[ 4830.518155] usb 5-3: new high speed USB device using ehci_hcd and address 14
[ 4830.652712] usb 5-3: configuration #1 chosen from 1 choice
[ 4830.653246] scsi9 : SCSI emulation for USB Mass Storage devices
[ 4830.653693] usb-storage: device found at 14
[ 4830.653707] usb-storage: waiting for device to settle before scanning
[ 4835.645555] usb-storage: device scan complete
[ 4835.680821] scsi 9:0:0:0: Direct-Access     Maxtor 6 Y250M0           YAR5 PQ: 0 ANSI: 0
[ 4835.688109] sd 9:0:0:0: [sdb] 490234751 512-byte hardware sectors (251000 MB)
[ 4835.689223] sd 9:0:0:0: [sdb] Write Protect is off
[ 4835.689229] sd 9:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 4835.689233] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[ 4835.690591] sd 9:0:0:0: [sdb] 490234751 512-byte hardware sectors (251000 MB)
[ 4835.691955] sd 9:0:0:0: [sdb] Write Protect is off
[ 4835.691961] sd 9:0:0:0: [sdb] Mode Sense: 03 00 00 00
[ 4835.691964] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[ 4835.691970]  sdb: sdb1
[ 4835.721079] sd 9:0:0:0: [sdb] Attached SCSI disk
[ 4835.721148] sd 9:0:0:0: Attached scsi generic sg2 type 0
[ 4865.939267] usb 5-3: reset high speed USB device using ehci_hcd and address 14
[ 4896.130450] usb 5-3: reset high speed USB device using ehci_hcd and address 14
[ 4926.321702] usb 5-3: reset high speed USB device using ehci_hcd and address 14
[ 4956.512918] usb 5-3: reset high speed USB device using ehci_hcd and address 14
[ 4986.704136] usb 5-3: reset high speed USB device using ehci_hcd and address 14
[ 4990.309994] sd 9:0:0:0: [sdb] <6>usb 5-3: USB disconnect, address 14
[ 4990.310008] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
[ 4990.310012] end_request: I/O error, dev sdb, sector 490223471
[ 4990.310017] printk: 104 messages suppressed.
[ 4990.310022] Buffer I/O error on device sdb1, logical block 122555852
[ 4990.310106] sd 9:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
[ 4990.310112] end_request: I/O error, dev sdb, sector 490234744
[ 4990.310117] Buffer I/O error on device sdb, logical block 490234744
[ 4990.310750] scsi 9:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
[ 4990.310758] end_request: I/O error, dev sdb, sector 490234745
[ 4990.310763] Buffer I/O error on device sdb, logical block 490234745
[ 4990.310770] Buffer I/O error on device sdb, logical block 490234746
[ 4990.310775] Buffer I/O error on device sdb, logical block 490234747
[ 4990.310779] Buffer I/O error on device sdb, logical block 490234748
[ 4990.310784] Buffer I/O error on device sdb, logical block 490234749
[ 4990.310789] Buffer I/O error on device sdb, logical block 490234750
[ 4990.313222] Buffer I/O error on device sdb, logical block 490234744
[ 4990.313240] Buffer I/O error on device sdb, logical block 490234745

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mauro@afrika:~$ sudo fsck /dev/sdb
[sudo] password for mauro: 
fsck 1.40.8 (13-Mar-2008)
e2fsck 1.40.8 (13-Mar-2008)
fsck.ext2: Superblock invalid, trying backup blocks...
fsck.ext2: Bad magic number in super-block while trying to open /dev/sdb

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

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mauro@afrika:~$ sudo e2fsck -b 8193 /dev/sdb
[sudo] password for mauro: 
e2fsck 1.40.8 (13-Mar-2008)
e2fsck: Device or resource busy while trying to open /dev/sdb
Filesystem mounted or opened exclusively by another program?
mauro@afrika:~$