Hi Everyone:
I have just installed new fedora 16. Although I am able to mount and work with 4GB usb stick, however i am unble to mount the external 500GB usb hard disk.
Here are the the messages from /var/log/messages
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Sep 19 18:51:35 localhost kernel: [ 3872.596040] usb 1-7: new high speed USB device number 19 using ehci_hcd
Sep 19 18:51:35 localhost kernel: [ 3872.711853] usb 1-7: New USB device found, idVendor=4971, idProduct=1012
Sep 19 18:51:35 localhost kernel: [ 3872.711856] usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Sep 19 18:51:35 localhost kernel: [ 3872.711859] usb 1-7: Product: Touro Mobile Pro
Sep 19 18:51:35 localhost kernel: [ 3872.711861] usb 1-7: Manufacturer: Hitachi GST
Sep 19 18:51:35 localhost kernel: [ 3872.711863] usb 1-7: SerialNumber: 02100111017000000776
Sep 19 18:51:35 localhost kernel: [ 3872.718346] scsi20 : uas
Sep 19 18:51:35 localhost mtp-probe: checking bus 1, device 19: "/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-7"
Sep 19 18:51:35 localhost mtp-probe: bus: 1, device: 19 was not an MTP device
Sep 19 18:51:38 localhost kernel: [ 3876.088241] scsi 20:0:0:0: Direct-Access Hitachi Touro Mobile Pro C70E PQ: 0 ANSI: 4
Sep 19 18:51:45 localhost kernel: [ 3883.008017] scsi 20:0:0:0: uas_eh_abort_handler tag 0
Sep 19 18:51:45 localhost kernel: [ 3883.008022] scsi 20:0:0:0: uas_eh_device_reset_handler tag 0
Sep 19 18:51:45 localhost kernel: [ 3883.008025] scsi 20:0:0:0: uas_eh_target_reset_handler tag 0
Sep 19 18:51:45 localhost kernel: [ 3883.008027] scsi 20:0:0:0: uas_eh_bus_reset_handler tag 0
Sep 19 18:51:45 localhost kernel: [ 3883.110028] usb 1-7: reset high speed USB device number 19 using ehci_hcd
Sep 19 18:51:45 localhost kernel: [ 3883.225365] scsi 20:0:0:0: Device offlined - not ready after error recovery
Sep 19 18:51:45 localhost kernel: [ 3883.225385] scsi 20:0:0:0: rejecting I/O to offline device
Sep 19 18:51:45 localhost kernel: [ 3883.225393] scsi 20:0:0:0: rejecting I/O to offline device
Sep 19 18:51:45 localhost kernel: [ 3883.226625] scsi 20:0:0:1: Enclosure Hitachi SES C70E PQ: 0 ANSI: 4
Sep 19 18:51:45 localhost kernel: [ 3883.226852] scsi 20:0:0:2: uas_sense_old: urb length 26 disagrees with IU sense data length 510, using 18 bytes of sense data
Sep 19 18:51:45 localhost kernel: [ 3883.227204] sd 20:0:0:0: Attached scsi generic sg2 type 0
Sep 19 18:51:45 localhost kernel: [ 3883.227328] ses 20:0:0:1: Attached Enclosure device
Sep 19 18:51:45 localhost kernel: [ 3883.227432] ses 20:0:0:1: Attached scsi generic sg3 type 13
Sep 19 18:52:16 localhost kernel: [ 3914.080025] sd 20:0:0:0: uas_eh_abort_handler tag 0
Sep 19 18:52:16 localhost kernel: [ 3914.080030] sd 20:0:0:0: uas_eh_device_reset_handler tag 0
Sep 19 18:52:16 localhost kernel: [ 3914.080033] sd 20:0:0:0: uas_eh_target_reset_handler tag 0
Sep 19 18:52:16 localhost kernel: [ 3914.080034] sd 20:0:0:0: uas_eh_bus_reset_handler tag 0
Sep 19 18:52:16 localhost kernel: [ 3914.182031] usb 1-7: reset high speed USB device number 19 using ehci_hcd
Sep 19 18:52:16 localhost kernel: [ 3914.297375] sd 20:0:0:0: Device offlined - not ready after error recovery
Sep 19 18:52:16 localhost kernel: [ 3914.297400] sd 20:0:0:0: rejecting I/O to offline device
Sep 19 18:52:16 localhost kernel: [ 3914.297410] sd 20:0:0:0: rejecting I/O to offline device
Sep 19 18:52:16 localhost kernel: [ 3914.297413] sd 20:0:0:0: rejecting I/O to offline device
Sep 19 18:52:16 localhost kernel: [ 3914.297416] sd 20:0:0:0: [sdb] READ CAPACITY failed
Sep 19 18:52:16 localhost kernel: [ 3914.297418] sd 20:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Sep 19 18:52:16 localhost kernel: [ 3914.297422] sd 20:0:0:0: [sdb] Sense not available.
Sep 19 18:52:16 localhost kernel: [ 3914.297425] sd 20:0:0:0: rejecting I/O to offline device
Sep 19 18:52:16 localhost kernel: [ 3914.297428] sd 20:0:0:0: [sdb] Write Protect is off
Sep 19 18:52:16 localhost kernel: [ 3914.297433] sd 20:0:0:0: rejecting I/O to offline device
Sep 19 18:52:16 localhost kernel: [ 3914.297435] sd 20:0:0:0: [sdb] Asking for cache data failed
Sep 19 18:52:16 localhost kernel: [ 3914.297437] sd 20:0:0:0: [sdb] Assuming drive cache: write through
Sep 19 18:52:16 localhost kernel: [ 3914.297739] sd 20:0:0:0: [sdb] Attached SCSI disk
Sep 19 18:52:16 localhost ata_id[7802]: unable to open '/dev/sdb'
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.... Really appreciate your help. Blacklisting UAS worked like a charm. 
Linear Mode
