mountroot> while booting r255342 memstick

[Uzumaki Naruto]

Hi,
I downloaded FreeBSD-10.0-CURRENT-amd64-20130907-r255342-memstick.img and dd into KINGSTON DT 101 G2 1.00 USB pendrive

boot it from Intel I5 laptop but hang
screen output as below.

Root mount waiting for: usbus0
ugen0.3: <SunplusIT INC.> at usbus0
Trying to mount root from ufs:/dev/ufs/FreeBSD_Install [ro,noatime]...
mountroot: waiting for device /dev/ufs/FreeBSD_Install ...
Mounting from ufs:/dev/ufs/FreeBSD_Install failed with error 19.

mountroot> ?

List of GEOM managed disk devices:
    diskid/DISK-TEA553QBGV3WZ4Gs1 diskid/DISK-TEA553QBGV3WZ4G ada0s1 cd0 ada0

mountroot> ufs:/dev/da0s1a
Trying to mount root from ufs:/dev/da0s1a []...
mountroot: waiting for device /dev/da0s1a ...
Mounting from ufs:/dev/da0s1a failed with error 19

// i take out the usb pendrive and put it back

mountroot> ufs:/dev/da0s1a
Trying to mount root from ufs:/dev/da0s1a []...
mountroot: waiting for device /dev/da0s1a ...
ugen0.2: <Kingston> at usbus0 (disconnected)
umass0: at uhub0, port 1, addr 1 (disconnected)
ugen0.2: <Kingston> at usbus0
umass0: <Kingston DT 101 G2, class 0/0, rev 2.00/1.00, addr 3> on usbus0
umass0: SCSI over Bulk-Only; quirks = 0x0100
umass0:3:0:-1: Attached to scbus3
da0 at umass-sim0 bus 0 scbus3 target 0 lun 0
da0: <Kingston DT 101 G2 1.00> Removable Direct Access SCSI-0 device
da0: 40.000MB/s transfers
da0: 3690MB (7557704 512 byte sectors: 255H 63S/T 470C)
da0: quirks=0x2<NO_6_BYTE>
(da0:umass-sim0:0:0:0): got CAM status 0x50
(da0:umass-sim0:0:0:0): fatal error, failed to attach to device
(da0:umass-sim0:0:0:0): lost device - 0 outstanding, 5 refs
(da0:umass-sim0:0:0:0): removing device entry
Mounting from ufs:/dev/da0s1a failed with error 19.

Any idea to troubleshoot this issue?
Thank you.