Installing FC16 DVD ISO image via USB key can't see USB device

[Peter Butler]

I have created a USB installer for the FC16 DVD ISO image via the
livecd-iso-to-disk tool, as detailed on the Fedora wiki.  I also included
the appropriate "repo=hd:<device>:/path/file" boot parameter to the kernel
command-line, as the wiki states that for all releases prior to FC17 this
must be added.

My USB installer boots the kernel and initrd and starts to run anaconda,
but soon complains that it is "Unable to download the kickstart file."
which had been specified in the kernel command-line as "hd:sdb1:/ks1.cfg".
 I've tried changing this (just for the sake of argument) to sda1, sdb2
etc, but sdb1 *is* indeed the device with the kickstart file (ks1.cfg). 
Indeed even in the kernel boot output the device can be seen:

[    5.794336] usb 2-1.2: New USB device found, idVendor=0951, idProduct=1642
[    5.794344] usb 2-1.2: New USB device strings: Mfr=1, Product=2,
SerialNumbe3
[    5.794351] usb 2-1.2: Product: DT 101 G2
[    5.794356] usb 2-1.2: Manufacturer: KINGSTON
[    5.794360] usb 2-1.2: SerialNumber: 001CC0EC34BBAC41B64402BA
.
.
.
[    9.881948] scsi 4:0:0:0: Direct-Access                              
1.00 P2
[    9.891143] sd 4:0:0:0: Attached scsi generic sg1 type 0
[    9.891886] sd 4:0:0:0: [sdb] 15204352 512-byte logical blocks: (7.78
GB/7.2)
[    9.894032] sd 4:0:0:0: [sdb] Write Protect is off
[    9.896133] sd 4:0:0:0: [sdb] Write cache: disabled, read cache:
enabled, doA
[    9.902880]  sdb: sdb1 sdb2
[    9.926528] sd 4:0:0:0: [sdb] Attached SCSI removable disk