my usb 3.0 is not mountable

[junkone]

this western digital 3 TB drive was mounting before and suddenly it stopped mounting.
the logs shows that the router is reading it but usb icon shows unmounted. not sure what went wrong.
this drive is working on wind 7

pr 16 19:35:12 Samba Server: smb daemon is stoped
Apr 16 19:35:12 kernel: usb 1-1.2: new high speed USB device using ehci_hcd and address 5
Apr 16 19:35:12 kernel: usb 1-1.2: configuration #1 chosen from 1 choice
Apr 16 19:35:12 kernel: scsi2 : SCSI emulation for USB Mass Storage devices
Apr 16 19:35:13 kernel: usb 1-1.2: USB disconnect, address 5
Apr 16 19:35:13 kernel: usb 1-1.2: new high speed USB device using ehci_hcd and address 6
Apr 16 19:35:13 kernel: usb 1-1.2: configuration #1 chosen from 1 choice
Apr 16 19:35:13 kernel: scsi3 : SCSI emulation for USB Mass Storage devices
Apr 16 19:35:13 kernel: usb 1-1.2: USB disconnect, address 6
Apr 16 19:35:13 kernel: usb 1-1.2: new high speed USB device using ehci_hcd and address 7
Apr 16 19:35:13 kernel: usb 1-1.2: configuration #1 chosen from 1 choice
Apr 16 19:35:13 kernel: scsi4 : SCSI emulation for USB Mass Storage devices
Apr 16 19:35:14 kernel: usb 1-1.2: USB disconnect, address 7
Apr 16 19:35:14 kernel: usb 1-1.2: new high speed USB device using ehci_hcd and address 8
Apr 16 19:35:14 kernel: usb 1-1.2: configuration #1 chosen from 1 choice
Apr 16 19:35:14 kernel: scsi5 : SCSI emulation for USB Mass Storage devices
Apr 16 19:35:15 kernel: usb 1-1.2: USB disconnect, address 8
Apr 16 19:35:19 kernel: usb 1-1.1: new high speed USB device using ehci_hcd and address 9
Apr 16 19:35:19 kernel: usb 1-1.1: configuration #1 chosen from 1 choice
Apr 16 19:35:19 kernel: scsi6 : SCSI emulation for USB Mass Storage devices
Apr 16 19:35:21 kernel: scsi 6:0:0:0: Direct-Access WD My Book 1230 1050 PQ: 0 ANSI: 6
Apr 16 19:35:26 kernel: sd 6:0:0:0: [sda] Spinning up disk........ready
Apr 16 19:35:26 kernel: sd 6:0:0:0: [sda] 732558336 4096-byte hardware sectors (3000559 MB)
Apr 16 19:35:26 kernel: sd 6:0:0:0: [sda] Write Protect is off
Apr 16 19:35:26 kernel: sd 6:0:0:0: [sda] Assuming drive cache: write through
Apr 16 19:35:26 kernel: sd 6:0:0:0: [sda] 732558336 4096-byte hardware sectors (3000559 MB)
Apr 16 19:35:26 kernel: sd 6:0:0:0: [sda] Assuming drive cache: write through
Apr 16 19:35:26 kernel: sda:
Apr 16 19:35:26 kernel: sd 6:0:0:0: [sda] Attached SCSI disk
Apr 16 19:35:27 kernel: sd 6:0:0:0: Attached scsi generic sg1 type 0
Apr 16 19:35:27 kernel: scsi 6:0:0:1: Enclosure WD SES Device 1050 PQ: 0 ANSI: 6
Apr 16 19:35:27 kernel: scsi 6:0:0:1: Attached scsi generic sg2 type 13