Hard drive install (upgrade) from USB drive?

[Wil Cooley]

According to the installation guide, I should be able to do a hard drive 
installation from sources on a USB drive:

(from http://docs.fedoraproject.org/install-guide/f7/en_US/sn-installing-from-harddrive.html)

"Once you have booted your computer, you may use ISO image files of the 
Fedora discs to continue the installation process. The ISO files must be 
located on a hard drive that is either internal to the computer, or 
attached to the machine by USB."

My experience, however, is that it does not work; when I boot into the
installer and am prompted for sources, my USB drive is not among the 
options presented as source partitions.  My suspicion is that usb-storage
is not loaded; if I unplug and plug my drive, the kernel messages are 
(approximately):

usb 5-8: USB disconnect, address 5
usb 5-8: new high speed USB device using ehci_hcd and address 6
usb 5-8: configuration #1 chosen from 1 choice

Normally, however, plugging in my drive results in the following messages:

usb 5-8: USB disconnect, address 5
usb 5-8: new high speed USB device using ehci_hcd and address 6
usb 5-8: configuration #1 chosen from 1 choice
scsi3 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 6
usb-storage: waiting for device to settle before scanning
scsi 3:0:0:0: Direct-Access     IC25N030 ATCS04-0         CA3O PQ: 0 ANSI: 0 CCS
SCSI device sdb: 58605120 512-byte hdwr sectors (30006 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 14 00 00
sdb: assuming drive cache: write through
SCSI device sdb: 58605120 512-byte hdwr sectors (30006 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 14 00 00
sdb: assuming drive cache: write through
 sdb: sdb1
sd 3:0:0:0: Attached scsi disk sdb
sd 3:0:0:0: Attached scsi generic sg1 type 0
usb-storage: device scan complete

I cannot confirm exactly what is happening, however, since even when booted
with 'expert' I am not yet given a shell.

I should note also that I am not booting from the USB drive; I am booting
from diskboot.img through grub (and memdisk from syslinux) or using the
kernel and initrd from images/pxeboot.  I explored the initrd and the 
modules.cgz contained therein and confirmed that usb-storage.ko is included.

Any other suggestions before I open a Bugzilla ticket?  (I have searched 
Bugzilla too; this is the only related item I have found, but it is woefully
lacking in either clarity or responses: 
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=242322 )

Also, is there an updates.img available?  I do not see one on any of the
obvious directories on the download servers; according to David Cantrell
there should be one: http://www.burdell.org/?cat=11

Wil