Thanks for your help and sorry, I wasn't aware they were unrelated.

Here's the output of your command:
Code:
May  7 07:44:32 Gibber-Gunyah kernel: [ 1392.810810] usb 4-4: new high speed USB device using ehci_hcd and address 4
May  7 07:44:32 Gibber-Gunyah NetworkManager: <debug> [1210110272.576388] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/usb_device_67b_3507_0'). 
May  7 07:44:32 Gibber-Gunyah kernel: [ 1392.945136] usb 4-4: configuration #1 chosen from 1 choice
May  7 07:44:32 Gibber-Gunyah kernel: [ 1392.952519] scsi3 : SCSI emulation for USB Mass Storage devices
May  7 07:44:32 Gibber-Gunyah kernel: [ 1392.954172] usb-storage: device found at 4
May  7 07:44:32 Gibber-Gunyah kernel: [ 1392.954181] usb-storage: waiting for device to settle before scanning
May  7 07:44:32 Gibber-Gunyah NetworkManager: <debug> [1210110272.682408] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/usb_device_67b_3507_0_if0'). 
May  7 07:44:32 Gibber-Gunyah NetworkManager: <debug> [1210110272.752306] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/usb_device_67b_3507_0_usbraw'). 
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.945798] usb-storage: device scan complete
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.946683] scsi 3:0:0:0: Direct-Access     ST332062 0A               3.AA PQ: 0 ANSI: 0
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.949722] sd 3:0:0:0: [sdc] 625142448 512-byte hardware sectors (320073 MB)
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.950585] sd 3:0:0:0: [sdc] Write Protect is off
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.950590] sd 3:0:0:0: [sdc] Mode Sense: 03 00 00 00
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.950595] sd 3:0:0:0: [sdc] Assuming drive cache: write through
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.951584] sd 3:0:0:0: [sdc] 625142448 512-byte hardware sectors (320073 MB)
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.952453] sd 3:0:0:0: [sdc] Write Protect is off
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.952458] sd 3:0:0:0: [sdc] Mode Sense: 03 00 00 00
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.952461] sd 3:0:0:0: [sdc] Assuming drive cache: write through
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.952467]  sdc: sdc1 sdc2 sdc3
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.972551] sd 3:0:0:0: [sdc] Attached SCSI disk
May  7 07:44:37 Gibber-Gunyah kernel: [ 1397.972650] sd 3:0:0:0: Attached scsi generic sg4 type 0
May  7 07:44:37 Gibber-Gunyah NetworkManager: <debug> [1210110277.716294] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/usb_device_67b_3507_0_if0_scsi_host'). 
May  7 07:44:37 Gibber-Gunyah NetworkManager: <debug> [1210110277.737121] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/usb_device_67b_3507_0_if0_scsi_host_scsi_device_lun0'). 
May  7 07:44:37 Gibber-Gunyah NetworkManager: <debug> [1210110277.760469] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/usb_device_67b_3507_0_if0_scsi_host_scsi_device_lun0_scsi_generic'). 
May  7 07:44:38 Gibber-Gunyah NetworkManager: <debug> [1210110278.026685] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/storage_serial_ST332062_0A_0_0_0'). 
May  7 07:44:38 Gibber-Gunyah NetworkManager: <debug> [1210110278.136524] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/volume_uuid_2436F04D50241F91'). 
May  7 07:44:38 Gibber-Gunyah NetworkManager: <debug> [1210110278.318910] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/volume_uuid_a4b453a4_af39_42ed_9e08_ba7e076f6a2d'). 
May  7 07:44:38 Gibber-Gunyah NetworkManager: <debug> [1210110278.576726] nm_hal_device_added(): New device added (hal udi is '/org/freedesktop/Hal/devices/volume_uuid_60A0_7E59'). 
May  7 07:44:38 Gibber-Gunyah ntfs-3g[5885]: Version 1.913 
May  7 07:44:38 Gibber-Gunyah ntfs-3g[5885]: Mounted /dev/sdc3 (Read-Write, label "EHStorage3", NTFS 3.1) 
May  7 07:44:38 Gibber-Gunyah ntfs-3g[5885]: Cmdline options: rw,nosuid,nodev,locale=en_AU.UTF-8 
May  7 07:44:38 Gibber-Gunyah ntfs-3g[5885]: Mount options: noatime,rw,nosuid,nodev,silent,allow_other,nonempty,fsname=/dev/sdc3,blkdev,blksize=4096 
May  7 07:44:38 Gibber-Gunyah hald: mounted /dev/sdc3 on behalf of uid 1000
May  7 07:44:38 Gibber-Gunyah kernel: [ 1399.337801] JBD: no valid journal superblock found
May  7 07:44:38 Gibber-Gunyah kernel: [ 1399.337818] EXT3-fs: error loading journal.
May  7 07:44:39 Gibber-Gunyah hald: mounted /dev/sdc2 on behalf of uid 1000
I guess the only relevant bit is "JBD: no valid journal superblock found"? I was originally mounting this on my laptop via firewire, but as you can see, I'm now mounting it via USB2.0 on my desktop pc. It's being auto-mounted when I turn it on, it's not in fstab.