howto boot from usb iso?

I tried copying f15 tc1 iso to my 16G usb using dd, but laptop doesn't try to
boot from it. I did change boot order at power up.

I wrote iso to /dev/sdc (not to a partition). Does that matter?

May 3 10:18:12 nbecker1 kernel: [ 168.382228] usb 2-2: new high speed USB
device using ehci_hcd and address 4
May 3 10:18:12 nbecker1 kernel: [ 168.496892] usb 2-2: New USB device found,
idVendor=0781, idProduct=5406
May 3 10:18:12 nbecker1 kernel: [ 168.496899] usb 2-2: New USB device strings:
Mfr=1, Product=2, SerialNumber=3
May 3 10:18:12 nbecker1 kernel: [ 168.496905] usb 2-2: Product: U3 Cruzer
Micro
May 3 10:18:12 nbecker1 kernel: [ 168.496909] usb 2-2: Manufacturer: SanDisk
May 3 10:18:12 nbecker1 kernel: [ 168.496912] usb 2-2: SerialNumber:
45308113A192A7E5
May 3 10:18:12 nbecker1 kernel: [ 168.498704] scsi6 : usb-storage 2-2:1.0
May 3 10:18:13 nbecker1 kernel: [ 169.499352] scsi 6:0:0:0: Direct-Access
SanDisk U3 Cruzer Micro 8.01 PQ: 0 ANSI: 0 CCS
May 3 10:18:13 nbecker1 kernel: [ 169.499933] scsi 6:0:0:1: CD-ROM
SanDisk U3 Cruzer Micro 8.01 PQ: 0 ANSI: 0
May 3 10:18:13 nbecker1 kernel: [ 169.501962] sd 6:0:0:0: Attached scsi
generic sg3 type 0
May 3 10:18:13 nbecker1 kernel: [ 169.511865] sr1: scsi3-mmc drive: 48x/48x
tray
May 3 10:18:13 nbecker1 kernel: [ 169.512324] sr 6:0:0:1: Attached scsi
generic sg4 type 5
May 3 10:18:13 nbecker1 kernel: [ 169.514988] sd 6:0:0:0: [sdc] Attached SCSI
removable disk
May 3 10:18:16 nbecker1 kernel: [ 171.691310] sd 6:0:0:0: [sdc] 31306239 512-
byte logical blocks: (16.0 GB/14.9 GiB)
May 3 10:18:16 nbecker1 kernel: [ 171.692492] sd 6:0:0:0: [sdc] Assuming drive
cache: write through
May 3 10:18:16 nbecker1 kernel: [ 171.694488] sd 6:0:0:0: [sdc] Assuming drive
cache: write through
May 3 10:18:16 nbecker1 kernel: [ 171.694500] sdc: unknown partition table


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