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I have an external wd my passport connected via USB 2.0. Yesterday I have tried to format it using disk utility but somehow it could not complete successfully. Now its showing unknown volume 0.0kb. I am not able to format it anyhow. I have tried many things and also have googled.

Somehow I have come to know about mkfs command, but it shows some unable to reread partition table error. I have also tried $dmesg | grep scsi and I got following information:

$ dmesg | grep scsi
[    2.405840] scsi0 : ata_piix
[    2.405946] scsi1 : ata_piix
[    2.594257] scsi 1:0:0:0: CD-ROM            NECVMWar VMware IDE CDR10 1.00 PQ: 0 ANSI: 5
[    2.594720] sr0: scsi3-mmc drive: 1x/1x writer dvd-ram cd/rw xa/form2 cdda tray
[    2.594895] sr 1:0:0:0: Attached scsi CD-ROM sr0
[    2.595054] sr 1:0:0:0: Attached scsi generic sg0 type 5
[    2.892569] scsi2 : ioc0: LSI53C1030 B0, FwRev=01032920h, Ports=1, MaxQ=128, IRQ=17
[    3.012719] scsi 2:0:0:0: Direct-Access     VMware,  VMware Virtual S 1.0  PQ: 0 ANSI: 2
[    3.012727] scsi target2:0:0: Beginning Domain Validation
[    3.013261] scsi target2:0:0: Domain Validation skipping write tests
[    3.013263] scsi target2:0:0: Ending Domain Validation
[    3.013288] scsi target2:0:0: FAST-40 WIDE SCSI 80.0 MB/s ST (25 ns, offset 127)
[    3.014889] sd 2:0:0:0: Attached scsi generic sg1 type 0
[   49.346171] scsi3 : usb-storage 1-1:1.0
[   50.355834] scsi 3:0:0:0: Direct-Access     WD       My Passport 0740 1003 PQ: 0 ANSI: 6
[   50.363324] scsi 3:0:0:1: Enclosure         WD       SES Device       1003 PQ: 0 ANSI: 6
[   50.365120] sd 3:0:0:0: Attached scsi generic sg2 type 0
[   50.366874] scsi 3:0:0:1: Attached scsi generic sg3 type 13
[  243.458257] scsi4 : usb-storage 1-1:1.0
[  244.526476] scsi 4:0:0:0: Direct-Access     WD       My Passport 0740 1003 PQ: 0 ANSI: 6
[  244.573385] scsi 4:0:0:1: Enclosure         WD       SES Device       1003 PQ: 0 ANSI: 6
[  244.574217] sd 4:0:0:0: Attached scsi generic sg2 type 0
[  244.574412] scsi 4:0:0:1: Attached scsi generic sg3 type 13
[  252.713434] scsi 4:0:0:1: Failed to get diagnostic page 0x8000002
[  252.713437] scsi 4:0:0:1: Failed to bind enclosure -19

and sometimes my harddisk does not get detected. I am worried. Is there anyone who can help me?

Thanks in advance.

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1 Answer 1

check if you see "unpartitioned / free space" in gparted; if so: just create a partition!

see External USB HDD Unreadable After Formatting and How to format a USB or external drive?

(the question may be a duplicate)

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thanks fro reply ..nutty about natty..but i have tried this...it is not showing in gparted..its just showing in disk utility unknown volume..with size 0 kb..if i try to format it using disk utility it returns following error: –  Neeraj Feb 28 '13 at 10:49
    
just some random, not well-founded thoughts of what you could try additionally: boot from gparted live-CD, boot from a different OS (e.g. windoze) and see what pops up (USB behaves differently there...), you may find some (even free) utilities on terabyte unlimited . com –  nutty about natty Feb 28 '13 at 11:14
    
thanks @nuttyaboutnatty...i'll try this and will respond.. –  Neeraj Feb 28 '13 at 11:24
    
i have tried to boot harddisk from windows as well..but in windows harddisk was not recognized... –  Neeraj Feb 28 '13 at 11:35
    
i am getting this error while formatting from disk utility: Error creating partition table: helper exited with exit code 1: In part_create_partition_table: device_file=/dev/sdb, scheme=0 ped_device_get() failed –  Neeraj Feb 28 '13 at 12:05
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