pendrive not detecting

hi, i have this 2 gb pendrive which was working fine till yesterday. i was transferring some data to the pendrive the system just become unresponsive. so, i had to shut down the system. when restarted it, it started behaving weirdly.. with pendrive attached, the system no longer starts, it just become unresponsive on the first screen.. Gparted also become unresponsive with the msg - 'scanning all devices.....' .. even fdisk -l just gives the details of internal harddrive and the cursor keeps blinking... dmesg | tail -100 gives following output..

[ 4111.100070] usb 1-1: reset high speed USB device using ehci_hcd and address 7
[ 4142.100085] usb 1-1: reset high speed USB device using ehci_hcd and address 7
[ 4173.100083] usb 1-1: reset high speed USB device using ehci_hcd and address 7
[ 4204.100080] usb 1-1: reset high speed USB device using ehci_hcd and address 7
[ 4205.408075] usb 1-1: reset high speed USB device using ehci_hcd and address 7
[ 4205.540880] sd 5:0:0:0: [sdb] Unhandled error code
[ 4205.540890] sd 5:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[ 4205.540900] sd 5:0:0:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
[ 4205.540927] end_request: I/O error, dev sdb, sector 0
[ 4205.540938] Buffer I/O error on device sdb, logical block 0
[ 4205.684083] usb 1-1: reset high speed USB device using ehci_hcd and address 7
[ 4205.827166] usb 1-1: device firmware changed
[ 4205.827225] usb 1-1: USB disconnect, address 7
[ 4205.827313] sd 5:0:0:0: [sdb] Unhandled error code
[ 4205.827320] sd 5:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[ 4205.827330] sd 5:0:0:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
[ 4205.827357] end_request: I/O error, dev sdb, sector 0
[ 4205.827367] Buffer I/O error on device sdb, logical block 0
[ 4205.827486] ldm_validate_partition_table(): Disk read failed.
[ 4205.827559] Dev sdb: unable to read RDB block 0
[ 4205.827672] unable to read partition table
[ 4205.833791] sd 5:0:0:0: [sdb] Attached SCSI removable disk
[ 4205.902580] hub 1-0:1.0: unable to enumerate USB device on port 1
[ 4206.292070] usb 2-1: new full speed USB device using uhci_hcd and address 3
[ 4206.416074] usb 2-1: device descriptor read/64, error -71
[ 4207.052060] usb 2-1: device not accepting address 3, error -71
[ 4207.164070] usb 2-1: new full speed USB device using uhci_hcd and address 4
[ 4207.284072] usb 2-1: device descriptor read/64, error -71
[ 4207.508072] usb 2-1: device descriptor read/64, error -71
[ 4207.724071] usb 2-1: new full speed USB device using uhci_hcd and address 5
[ 4208.140063] usb 2-1: device not accepting address 5, error -71
[ 4208.252062] usb 2-1: new full speed USB device using uhci_hcd and address 6
[ 4208.668067] usb 2-1: device not accepting address 6, error -71
[ 4208.668099] hub 2-0:1.0: unable to enumerate USB device on port 1
[ 4219.932077] usb 1-1: new high speed USB device using ehci_hcd and address 9
[ 4220.065828] usb 1-1: configuration #1 chosen from 1 choice
[ 4220.066841] scsi6 : SCSI emulation for USB Mass Storage devices
[ 4220.067165] usb-storage: device found at 9
[ 4220.067171] usb-storage: waiting for device to settle before scanning
[ 4225.067685] usb-storage: device scan complete
[ 4225.068639] scsi 6:0:0:0: Direct-Access Ut165 USB2FlashStorage 0.00 PQ: 0 ANSI: 2
[ 4225.071953] sd 6:0:0:0: Attached scsi generic sg2 type 0
[ 4225.076807] sd 6:0:0:0: [sdb] 3948544 512-byte logical blocks: (2.02 GB/1.88 GiB)
[ 4225.077359] sd 6:0:0:0: [sdb] Write Protect is off
[ 4225.077364] sd 6:0:0:0: [sdb] Mode Sense: 00 00 00 00
[ 4225.077368] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 4225.080839] sd 6:0:0:0: [sdb] Assuming drive cache: write through
[ 4225.080849] sdb:
[ 4248.867392] usb 1-1: USB disconnect, address 9
[ 4248.867556] sd 6:0:0:0: [sdb] Unhandled error code
[ 4248.867563] sd 6:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[ 4248.867573] sd 6:0:0:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
[ 4248.867600] end_request: I/O error, dev sdb, sector 0
[ 4248.867610] Buffer I/O error on device sdb, logical block 0
[ 4248.868947] sd 6:0:0:0: [sdb] Unhandled error code
[ 4248.868956] sd 6:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[ 4248.868966] sd 6:0:0:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
[ 4248.868993] end_request: I/O error, dev sdb, sector 0
[ 4248.869031] Buffer I/O error on device sdb, logical block 0
[ 4248.870622] ldm_validate_partition_table(): Disk read failed.
[ 4248.870700] Dev sdb: unable to read RDB block 0
[ 4248.870999] unable to read partition table
[ 4248.873417] sd 6:0:0:0: [sdb] Attached SCSI removable disk
[ 4313.268079] usb 1-1: new high speed USB device using ehci_hcd and address 10
[ 4313.401871] usb 1-1: configuration #1 chosen from 1 choice
[ 4313.402901] scsi7 : SCSI emulation for USB Mass Storage devices
[ 4313.403223] usb-storage: device found at 10
[ 4313.403230] usb-storage: waiting for device to settle before scanning
[ 4318.400371] usb-storage: device scan complete
[ 4318.401069] scsi 7:0:0:0: Direct-Access Ut165 USB2FlashStorage 0.00 PQ: 0 ANSI: 2
[ 4318.402132] sd 7:0:0:0: Attached scsi generic sg2 type 0
[ 4318.413930] sd 7:0:0:0: [sdb] 3948544 512-byte logical blocks: (2.02 GB/1.88 GiB)
[ 4318.414661] sd 7:0:0:0: [sdb] Write Protect is off
[ 4318.414671] sd 7:0:0:0: [sdb] Mode Sense: 00 00 00 00
[ 4318.414679] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[ 4318.418644] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[ 4318.418653] sdb:
[ 4349.100099] usb 1-1: reset high speed USB device using ehci_hcd and address 10
[ 4380.101060] usb 1-1: reset high speed USB device using ehci_hcd and address 10
[ 4405.850140] wlan0: direct probe to AP 00:14:6c:e6:d4:a3 (try 1)
[ 4406.048063] wlan0: direct probe to AP 00:14:6c:e6:d4:a3 (try 2)
[ 4406.248074] wlan0: direct probe to AP 00:14:6c:e6:d4:a3 (try 3)
[ 4406.250341] wlan0: direct probe responded
[ 4406.250350] wlan0: authenticate with AP 00:14:6c:e6:d4:a3 (try 1)
[ 4406.252395] wlan0: authenticated
[ 4406.252441] wlan0: associate with AP 00:14:6c:e6:d4:a3 (try 1)
[ 4406.258520] wlan0: RX AssocResp from 00:14:6c:e6:d4:a3 (capab=0x11 status=0 aid=3)
[ 4406.258529] wlan0: associated
[ 4406.260314] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 4411.100081] usb 1-1: reset high speed USB device using ehci_hcd and address 10
[ 4416.720046] wlan0: no IPv6 routers present
[ 4442.100083] usb 1-1: reset high speed USB device using ehci_hcd and address 10
[ 4473.100078] usb 1-1: reset high speed USB device using ehci_hcd and address 10
[ 4504.101077] usb 1-1: reset high speed USB device using ehci_hcd and address 10
[ 4504.233725] sd 7:0:0:0: [sdb] Unhandled error code
[ 4504.233735] sd 7:0:0:0: [sdb] Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK
[ 4504.233745] sd 7:0:0:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
[ 4504.233772] end_request: I/O error, dev sdb, sector 0
[ 4504.233784] Buffer I/O error on device sdb, logical block 0
[ 4535.101071] usb 1-1: reset high speed USB device using ehci_hcd and address 10

lsusb gives the following output which confirms that the pendrive is detected at the harddrive level...

Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 0a5c:2101 Broadcom Corp. A-Link BlueUsbA2 Bluetooth
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 010: ID 1307:0165 Transcend Information, Inc. 2GB/4GB Flash Drive
Bus 001 Device 002: ID 0c45:624f Microdia PC Camera (SN9C201 + OV9650)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

please help me with this... thanks..