live usb from isohybrid not mounts its second partition

[zsa]

12.10 ubuntu booted from livecd on usb stick, made from hybrid iso, dd'ed.

Cannot mount second partition on that usb stick, it is shown on laucher by label, but not accessible.

I think, that's because first partition not mounted, but disk mounted as a whole.

ubuntu@ubuntu:~$ sudo blkid
/dev/loop0: TYPE="squashfs"
/dev/sda1: UUID=<censored>
/dev/sdb1: LABEL="Ubuntu 12.10 i386" TYPE="iso9660"
/dev/sdb2: LABEL="Transcend" UUID="349E-2DBA" TYPE="vfat"

ubuntu@ubuntu:~$ mount | grep sdb
/dev/sdb on /cdrom type iso9660 (ro,noatime)

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-17-generic 3.5.0-17.28
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic i686
ApportVersion: 2.6.1-0ubuntu3
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 3242 F.... pulseaudio
 /dev/snd/controlC1: ubuntu 3242 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
CasperVersion: 1.328
Date: Thu Nov 1 00:29:00 2012
HotplugNewDevices:

HotplugNewMounts:

IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
MachineType: System manufacturer System Product Name
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
ProcFB: 0 nouveaufb
ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- debian-installer/language=ru keyboard-configuration/layoutcode?=ru
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-17-generic N/A
 linux-backports-modules-3.5.0-17-generic N/A
 linux-firmware 1.95
RfKill:

SourcePackage: linux
Symptom: storage
UdevMonitorLog:
 monitor will print the received events for:
 UDEV - the event which udev sends out after rule processing
UdisksMonitorLog:
 Monitoring the udisks daemon. Press Ctrl+C to exit.
 00:29:20.501: The udisks-daemon is running (name-owner :1.42).
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/30/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0502
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2N
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0502:bd04/30/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer