<s>
Virtual	B-Application
CD-ROM	I-Application
switching	I-Application
utilities	I-Application
are	O
programs	O
to	O
disable	O
the	O
virtual	B-Application
CD-ROM	I-Application
drive	O
found	O
on	O
many	O
devices	O
.	O
</s>
<s>
A	O
virtual	B-Application
CD-ROM	I-Application
switching	I-Application
utility	I-Application
is	O
a	O
mode	O
switching	O
tool	O
for	O
controlling	O
"	O
flip	O
flop	O
"	O
(	O
multiple	O
device	O
)	O
USB	B-Protocol
gear	O
.	O
</s>
<s>
Several	O
new	O
USB	B-Protocol
devices	I-Protocol
(	O
especially	O
high-speed	O
wireless	B-General_Concept
WAN	I-General_Concept
equipment	O
,	O
there	O
seems	O
to	O
be	O
a	O
chipset	B-Device
from	O
Qualcomm	O
offering	O
that	O
feature	O
)	O
have	O
their	O
Microsoft	B-Application
Windows	I-Application
device	O
drivers	O
on	O
board	O
;	O
when	O
plugged	O
in	O
for	O
the	O
first	O
time	O
they	O
act	O
like	O
a	O
USB	B-Protocol
flash	O
drive	O
and	O
start	O
installing	O
the	O
device	O
driver	O
from	O
there	O
.	O
</s>
<s>
After	O
that	O
(	O
and	O
on	O
every	O
consecutive	O
plugging	O
)	O
this	O
device	O
driver	O
switches	O
the	O
mode	O
internally	O
,	O
the	O
storage	O
device	O
vanishes	O
(	O
in	O
most	O
cases	O
)	O
,	O
and	O
a	O
new	O
device	O
(	O
like	O
a	O
USB	B-Protocol
modem	B-Application
)	O
shows	O
up	O
.	O
</s>
<s>
The	O
Wireless	B-General_Concept
WAN	I-General_Concept
(	O
WWAN	B-General_Concept
)	O
gear	O
maker	O
Option	O
calls	O
that	O
feature	O
"	O
ZeroCD	O
(	O
TM	O
)	O
"	O
.	O
</s>
<s>
With	O
USB	B-Protocol
sniffing	O
programs	O
and	O
libusb	B-Language
it	O
is	O
possible	O
to	O
eavesdrop	O
the	O
communication	O
of	O
the	O
MS	B-Application
Windows	I-Application
device	O
driver	O
,	O
to	O
isolate	O
the	O
command	B-Application
or	O
action	O
that	O
does	O
the	O
switching	O
and	O
to	O
reproduce	O
the	O
same	O
thing	O
under	O
the	O
rule	O
of	O
Linux	O
or	O
the	O
BSD	B-Operating_System
variants	O
.	O
</s>
<s>
The	O
problem	O
with	O
most	O
USB	B-Protocol
3G	B-Architecture
modems	B-Application
is	O
they	O
have	O
two	O
modes	O
.	O
</s>
<s>
In	O
one	O
mode	O
they	O
are	O
a	O
USB	B-Protocol
flash	O
drive	O
and	O
in	O
the	O
other	O
mode	O
they	O
are	O
a	O
modem	B-Application
.	O
</s>
<s>
Typically	O
they	O
only	O
ship	O
with	O
Windows	O
device	O
drivers	O
,	O
sometimes	O
Mac	B-Device
device	O
drivers	O
as	O
well	O
.	O
</s>
<s>
What	O
normally	O
happens	O
with	O
Windows	O
is	O
the	O
device	O
starts	O
up	O
as	O
a	O
USB	B-Protocol
flash	O
drive	O
,	O
the	O
hardware	B-Architecture
drivers	O
are	O
installed	O
and	O
then	O
they	O
are	O
responsible	O
for	O
"	O
switching	O
"	O
the	O
device	O
in	O
to	O
modem	B-Application
mode	O
so	O
you	O
can	O
use	O
it	O
.	O
</s>
<s>
This	O
"	O
switch	O
"	O
is	O
done	O
via	O
some	O
codes	O
,	O
specific	O
to	O
the	O
device	O
,	O
which	O
controlling	O
software	O
can	O
pass	O
as	O
a	O
command	B-Application
to	O
switch	O
from	O
disk	O
to	O
modem	B-Application
mode	O
.	O
</s>
<s>
The	O
virtual	B-Application
CD-ROM	I-Application
switching	I-Application
utility	I-Application
manages	O
the	O
switch	O
of	O
mode	O
from	O
disk	O
to	O
modem	B-Application
,	O
the	O
latter	O
disconnects	O
any	O
mounted	O
disk	O
containing	O
software	O
we	O
do	O
n't	O
care	O
about	O
that	O
wo	O
n't	O
work	O
anyway	O
and	O
,	O
crucially	O
,	O
creates	O
a	O
modem	B-Application
port/serial	O
device	O
(	O
usually	O
)	O
for	O
the	O
networkmanager	O
.	O
</s>
<s>
The	O
approach	O
of	O
adding	O
Virtual	B-Application
CD-ROM	I-Application
with	O
software	O
drivers	O
on	O
3G	B-Architecture
or	O
storage	O
devices	O
has	O
two	O
problems	O
:	O
it	O
presumably	O
raises	O
the	O
cost	O
of	O
the	O
device	O
,	O
and	O
it	O
may	O
ship	O
outdated	O
software	O
or	O
even	O
viruses	O
.	O
</s>
<s>
Most	O
of	O
the	O
times	O
,	O
up-to-date	O
drivers	O
are	O
anyway	O
built	O
into	O
the	O
operating	O
systems	O
(	O
after	O
all	O
,	O
on	O
systems	O
implementing	O
the	O
USB	B-Protocol
standard	O
like	O
Linux	O
,	O
any	O
3G	B-Architecture
device	O
is	O
a	O
USB	B-Protocol
serial	O
port	O
,	O
and	O
any	O
storage	O
device	O
is	O
a	O
...	O
USB	B-Protocol
storage	I-Protocol
device	I-Protocol
)	O
.	O
</s>
<s>
Virtual	B-Application
CD-ROM	I-Application
on	O
U3-compatible	O
devices	O
can	O
be	O
removed	O
by	O
a	O
software	O
tool	O
.	O
</s>
<s>
Some	O
3G	B-Architecture
devices	O
such	O
as	O
the	O
Huawei	O
support	O
complete	O
disabling	O
of	O
the	O
Virtual	B-Application
CD-ROM	I-Application
.	O
</s>
<s>
ZeroCD	O
:	O
When	O
a	O
device	O
uses	O
the	O
ZeroCD	O
method	O
means	O
that	O
it	O
behaves	O
as	O
a	O
USB	B-Protocol
CD-ROM	O
when	O
first	O
connected	O
,	O
with	O
a	O
virtual	B-Application
CD-ROM	I-Application
inserted	O
with	O
the	O
Windows	O
device	O
drivers	O
and	O
related	O
Cosmote	O
control	O
program	O
.	O
</s>
<s>
Once	O
the	O
Windows	O
device	O
drivers	O
are	O
installed	O
,	O
a	O
special	O
USB	B-Protocol
command	B-Application
is	O
sent	O
to	O
the	O
device	O
to	O
“	O
switch	O
”	O
it	O
to	O
modem	B-Application
mode	O
.	O
</s>
<s>
Ozerocdoff	O
:	O
It	O
temporarily	O
disables	O
ZeroCD	O
for	O
USB	B-Protocol
Option	O
WWAN	B-General_Concept
modem	B-Application
.	O
</s>
<s>
The	O
new	O
USB	B-Protocol
Option	O
WWAN	B-General_Concept
modem	B-Application
devices	O
support	O
a	O
CD-ROM	O
device	O
,	O
which	O
holds	O
the	O
needed	O
Windows	O
device	O
driver	O
to	O
use	O
the	O
WWAN	B-General_Concept
modem	B-Application
.	O
</s>
<s>
Therefore	O
,	O
the	O
firmware	O
of	O
the	O
WWAN	B-General_Concept
modem	B-Application
announces	O
during	O
the	O
USB	B-Protocol
enumeration	O
process	O
to	O
work	O
as	O
a	O
virtual	B-Application
CD-ROM	I-Application
device	O
with	O
its	O
vendor	O
name	O
"	O
ZOPTION	O
"	O
.	O
</s>
<s>
Ozerocdoff	O
is	O
a	O
solution	O
to	O
switch	O
off	O
the	O
ZERO-CD	O
and	O
allow	O
the	O
modem	B-Application
to	O
be	O
a	O
used	O
as	O
a	O
modem	B-Application
.	O
</s>
<s>
USB_ModeSwitch	O
:	O
It	O
is	O
a	O
virtual	B-Application
CD-ROM	I-Application
switching	I-Application
utility	I-Application
.	O
</s>
<s>
From	O
version	O
1.0.3	O
upwards	O
there	O
is	O
a	O
simple	O
framework	O
for	O
integrating	O
the	O
switching	O
with	O
udev	B-Application
(	O
the	O
device	O
manager	O
)	O
to	O
make	O
it	O
fully	O
automatic	O
.	O
</s>
<s>
Switch2modem	O
:	O
It	O
is	O
designed	O
for	O
switching	O
a	O
3G	B-Architecture
USB	B-Protocol
modem	B-Application
.	O
</s>
<s>
The	O
program	O
works	O
under	O
OpenSolaris	B-Operating_System
.	O
</s>
<s>
Fetch	O
utility	O
:	O
huaweiAktBbo.c	O
is	O
a	O
utility	O
that	O
can	O
be	O
compiled	B-Language
and	O
re-creates	O
the	O
USB	B-Protocol
communication	O
which	O
is	O
used	O
in	O
Windows	O
.	O
</s>
