Hi,<br> <br> While mounting one of the external hard disk we are getting the following error.<br> <br> Messages from dmesg:<br> usb 1-5: new high speed USB device using ehci_hcd and address 5<br> scsi4 : SCSI emulation for USB Mass Storage devices<br> usb-storage: device found at 5<br> usb-storage: waiting for device to settle before scanning<br> Vendor: ST340083 Model: 2A Rev: 0 0<br> Type: Direct-Access ANSI SCSI revision: 00<br> SCSI device sda: 781422768 512-byte hdwr sectors (400088 MB)<br> sda: assuming drive cache: write through<br> SCSI device sda: 781422768 512-byte hdwr sectors (400088 MB)<br> sda: assuming drive cache: write through<br> sda: sda1<br> Attached scsi disk sda at scsi4, channel 0, id 0, lun
0<br> usb-storage: device scan complete<br> SCSI error : <4 0 0 0> return code = 0x8000002<br> sda: Current: sense key: Medium Error<br> Additional sense: Unrecovered read error<br> end_request: I/O error, dev sda, sector 0<br> Buffer I/O error on device sda, logical block 0<br> SCSI error : <4 0 0 0> return code = 0x8000002<br> sda: Current: sense key: Medium Error<br> Additional sense: Unrecovered read error<br> end_request: I/O error, dev sda, sector 8<br> Buffer I/O error on device sda, logical block 1<br> nfs_statfs: statfs error = 116<br> SCSI error : <4 0 0 0> return code = 0x8000002<br> sda: Current: sense key: Medium Error<br> Additional sense: Unrecovered read error<br> end_request: I/O error, dev sda, sector 16<br> Buffer I/O error on device sda, logical block 2<br> SCSI error : <4 0 0 0> return code = 0x8000002<br> sda: Current: sense key: Medium Error<br>
Additional sense: Unrecovered read error<br> end_request: I/O error, dev sda, sector 24<br> Buffer I/O error on device sda, logical block 3<br> SCSI error : <4 0 0 0> return code = 0x8000002<br> sda: Current: sense key: Medium Error<br> Additional sense: Unrecovered read error<br> end_request: I/O error, dev sda, sector 32<br> Buffer I/O error on device sda, logical block 4<br> SCSI error : <4 0 0 0> return code = 0x8000002<br> sda: Current: sense key: Medium Error<br> Additional sense: Unrecovered read error<br> end_request: I/O error, dev sda, sector 40<br> Buffer I/O error on device sda, logical block 5<br> nfs_statfs: statfs error = 116<br> SCSI error : <4 0 0 0> return code = 0x8000002<br> sda: Current: sense key: Medium Error<br> Additional sense: Unrecovered read error<br> end_request: I/O error, dev sda, sector 48<br> Buffer I/O error on device sda, logical block 6<br> SCSI error : <4 0 0
0> return code = 0x8000002<br> sda: Current: sense key: Medium Error<br> Additional sense: Unrecovered read error<br> end_request: I/O error, dev sda, sector 56<br> Buffer I/O error on device sda, logical block 7<br> <br> <br> We have been working on this disk and suddenly crashed down and later we are not been able to mount it.<br> <br> Any suggestion how to recover the data would be greatly appriciated.<br> <br> Thanking you in advance.<br> <br> Regards<br> Soumyadeep<br> <p> 
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