Seeing this still on Karmic Beta:
Linux version 2.6.31-11-generic (buildd@yellow) (gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu4) ) #38-Ubuntu SMP Fri Oct 2 11:06:40 UTC 2009

It's a 1TB Toshiba USB drive and it also needs the afm. "max_sectors" trick. However, i'm under the expression that the drive worked flawless under Jaunty (since i managed to put a few hundred gigs onto it...).

~$ udevadm info --attribute-walk --name=/dev/sdg

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:12.2/usb1/1-3/1-3:1.0/host8/target8:0:0/8:0:0:0/block/sdg':
    KERNEL=="sdg"
    SUBSYSTEM=="block"
    DRIVER==""
    ATTR{range}=="16"
    ATTR{ext_range}=="256"
    ATTR{removable}=="0"
    ATTR{ro}=="0"
    ATTR{size}=="1953525168"
    ATTR{alignment_offset}=="0"
    ATTR{capability}=="52"
    ATTR{stat}=="  380490      385 15773797 14873260    65875     5634  8394456 26411760        4   759120 41284770"

  looking at parent device '/devices/pci0000:00/0000:00:12.2/usb1/1-3/1-3:1.0/host8/target8:0:0/8:0:0:0':
    KERNELS=="8:0:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS=="sd"
    ATTRS{device_blocked}=="0"
    ATTRS{type}=="0"
    ATTRS{scsi_level}=="3"
    ATTRS{vendor}=="TOSHIBA "
    ATTRS{model}=="USB 3.5"-HDD    "
    ATTRS{rev}=="100 "
    ATTRS{state}=="running"
    ATTRS{timeout}=="30"
    ATTRS{iocounterbits}=="32"
    ATTRS{iorequest_cnt}=="0x6cfb7"
    ATTRS{iodone_cnt}=="0x6cfb7"
    ATTRS{ioerr_cnt}=="0x8"
    ATTRS{modalias}=="scsi:t-0x00"
    ATTRS{evt_media_change}=="0"
    ATTRS{queue_depth}=="1"
    ATTRS{queue_type}=="none"
    ATTRS{max_sectors}=="128"

  looking at parent device '/devices/pci0000:00/0000:00:12.2/usb1/1-3/1-3:1.0/host8/target8:0:0':
    KERNELS=="target8:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:12.2/usb1/1-3/1-3:1.0/host8':
    KERNELS=="host8"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:12.2/usb1/1-3/1-3:1.0':
    KERNELS=="1-3:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb-storage"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bNumEndpoints}=="02"
    ATTRS{bInterfaceClass}=="08"
    ATTRS{bInterfaceSubClass}=="06"
    ATTRS{bInterfaceProtocol}=="50"
    ATTRS{modalias}=="usb:v0930p0B09d0112dc00dsc00dp00ic08isc06ip50"
    ATTRS{supports_autosuspend}=="0"
    ATTRS{interface}=="Bulk Only Interface"

  looking at parent device '/devices/pci0000:00/0000:00:12.2/usb1/1-3':
    KERNELS=="1-3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{configuration}=="Bulk Only Configuration"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bmAttributes}=="c0"
    ATTRS{bMaxPower}=="  2mA"
    ATTRS{urbnum}=="3077626"
    ATTRS{idVendor}=="0930"
    ATTRS{idProduct}=="0b09"
    ATTRS{bcdDevice}=="0112"
    ATTRS{bDeviceClass}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{speed}=="480"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="2"
    ATTRS{version}==" 2.00"
    ATTRS{maxchild}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{authorized}=="1"
    ATTRS{manufacturer}=="TOSHIBA"
    ATTRS{product}=="USB 3.5"-HDD"
    ATTRS{serial}=="000FF49a"

  looking at parent device '/devices/pci0000:00/0000:00:12.2/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{configuration}==""
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bMaxPower}=="  0mA"
    ATTRS{urbnum}=="67"
    ATTRS{idVendor}=="1d6b"
    ATTRS{idProduct}=="0002"
    ATTRS{bcdDevice}=="0206"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{speed}=="480"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="1"
    ATTRS{version}==" 2.00"
    ATTRS{maxchild}=="6"
    ATTRS{quirks}=="0x0"
    ATTRS{authorized}=="1"
    ATTRS{manufacturer}=="Linux 2.6.31-11-generic ehci_hcd"
    ATTRS{product}=="EHCI Host Controller"
    ATTRS{serial}=="0000:00:12.2"
    ATTRS{authorized_default}=="1"

  looking at parent device '/devices/pci0000:00/0000:00:12.2':
    KERNELS=="0000:00:12.2"
    SUBSYSTEMS=="pci"
    DRIVERS=="ehci_hcd"
    ATTRS{vendor}=="0x1002"
    ATTRS{device}=="0x4396"
    ATTRS{subsystem_vendor}=="0x1849"
    ATTRS{subsystem_device}=="0x4396"
    ATTRS{class}=="0x0c0320"
    ATTRS{irq}=="17"
    ATTRS{local_cpus}=="00000000,00000003"
    ATTRS{local_cpulist}=="0-1"
    ATTRS{modalias}=="pci:v00001002d00004396sv00001849sd00004396bc0Csc03i20"
    ATTRS{numa_node}=="0"
    ATTRS{broken_parity_status}=="0"
    ATTRS{msi_bus}==""
    ATTRS{companion}==""

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""