usb mount issue, xubuntu 12.04

[ 1583.000206] usb 1-2: new high-speed USB device number 4 using ehci_hcd
[ 1583.182523] Initializing USB Mass Storage driver...
[ 1583.183055] scsi7 : usb-storage 1-2:1.0
[ 1583.183368] usbcore: registered new interface driver usb-storage
[ 1583.183376] USB Mass Storage support registered.
[ 1583.237565] usbcore: registered new interface driver uas
[ 1584.182843] scsi 7:0:0:0: Direct-Access     WD       My Passport 0740 1003 PQ: 0 ANSI: 6
[ 1584.184486] scsi 7:0:0:1: Enclosure         WD       SES Device       1003 PQ: 0 ANSI: 6
[ 1584.189124] sd 7:0:0:0: Attached scsi generic sg2 type 0
[ 1584.195119] sd 7:0:0:0: [sdc] Spinning up disk...
[ 1584.198022] scsi 7:0:0:1: Attached scsi generic sg3 type 13
[ 1589.944327] .ready
[ 1589.945889] sd 7:0:0:0: [sdc] 625076224 512-byte logical blocks: (320 GB/298 GiB)
[ 1589.947095] sd 7:0:0:0: [sdc] Write Protect is off
[ 1589.947115] sd 7:0:0:0: [sdc] Mode Sense: 47 00 10 08
[ 1589.948711] sd 7:0:0:0: [sdc] No Caching mode page present
[ 1589.948729] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 1589.954964] sd 7:0:0:0: [sdc] No Caching mode page present
[ 1589.954982] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 1589.967612]  sdc: unknown partition table
[ 1589.975353] sd 7:0:0:0: [sdc] No Caching mode page present
[ 1589.975372] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 1589.975384] sd 7:0:0:0: [sdc] Attached SCSI disk
[ 1590.046430] ses 7:0:0:1: Attached Enclosure device
[ 1590.544529] EXT4-fs (sdc): warning: maximal mount count reached, running e2fsck is recommended
[ 1590.547877] EXT4-fs (sdc): recovery complete
[ 1590.547899] EXT4-fs (sdc): mounted filesystem with ordered data mode. Opts: (null)

*******then...

[ 1831.239295] ehci_hcd 0000:00:12.2: force halt; handshake ffffc9000064a024 00004000 00000000 -> -110
[ 1831.239310] ehci_hcd 0000:00:12.2: HC died; cleaning up
[ 1831.239451] usb 1-2: USB disconnect, device number 4
[ 1831.308302] sd 7:0:0:0: [sdc] Unhandled error code
[ 1831.308317] sd 7:0:0:0: [sdc]  Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[ 1831.308331] sd 7:0:0:0: [sdc] CDB: Read(10): 28 00 13 81 02 20 00 00 08 00
[ 1831.308361] end_request: I/O error, dev sdc, sector 327221792
[ 1831.320598] Aborting journal on device sdc-8.
[ 1831.320648] JBD2: I/O error detected when updating journal superblock for sdc-8.
[ 1831.320704] journal commit I/O error
[ 1831.333037] EXT4-fs error (device sdc): __ext4_get_inode_loc:3657: inode #10224209: block 40894533: comm pool: unable to read itable block
[ 1831.336386] usb 1-3: USB disconnect, device number 2
[ 1831.358304] EXT4-fs error (device sdc): ext4_put_super:818: Couldn't clean up the journal
[ 1831.358317] EXT4-fs (sdc): Remounting filesystem read-only
[ 1831.581915] usb 1-5: USB disconnect, device number 3

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