Are all USB Flash Memory sticks bootable?

[Fbsd1]

Have problem with being able to boot off an new 8GB USB Flash Memory 
stick. When I load the 8.0 disc1.iso to an 2GB USB Flash Memory stick it 
will boot fine. But when I do the same thing to a new 8GB USB Flash 
Memory stick it’s not recognized as bootable. I can access the installed 
partitions manually by mounting then on the 7.2 system. So I know the 
8GB stick has been loaded correctly. I am doing this on a 7.2 release.

Below are the console messages that get displayed when I plug in each of 
the USB Flash Memory stick. You can see a great difference between the 
first set of messages for the 8GB stick versus the 2GB stick that 
follows. I want to boot off the 8GB stick just like I do with the 2GB stick.

What is going on here? They should be handled the same way.


Brand new 8GB Kingston DataTraveler 120 purchased 7/16/09

  umass0: <Kingston DataTraveler 120, class 0/0, rev 2.00/1.00, addr 2> 
             on uhub1
  (probe0:umass-sim0:0:0:0): TEST UNIT READY. CDB: 0 0 0 0 0 0
  (probe0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
  (probe0:umass-sim0:0:0:0): SCSI Status: Check Condition
  (probe0:umass-sim0:0:0:0): UNIT ATTENTION asc:28,0
  (probe0:umass-sim0:0:0:0): Not ready to ready change, medium may have 
changed
  (probe0:umass-sim0:0:0:0): Retrying Command (per Sense Data)
  da0 at umass-sim0 bus 0 target 0 lun 0
  da0: <Kingston DataTraveler 120 1.00> Removable Direct Access SCSI-2 
device
  da0: 1.000MB/s transfers
  da0: 7643MB (15654848 512 byte sectors: 255H 63S/T 974C)
  GEOM_LABEL: Label for provider da0a is ufsid/4a615a2cc673eb3d.


# 3 year old 2GB Kingston DataTraveler
umass1: <vendor 0x0930 USB Flash Memory, class 0/0, rev 2.00/2.00,
          addr 3> on uhub1
da1 at umass-sim1 bus 1 target 0 lun 0
da1: < USB Flash Memory 6.50> Removable Direct Access SCSI-0 device
da1: 1.000MB/s transfers