<s>
Digital	B-Device
Linear	I-Device
Tape	I-Device
(	O
DLT	O
;	O
previously	O
called	O
CompacTape	B-Device
)	O
is	O
a	O
magnetic-tape	B-Architecture
data	I-Architecture
storage	I-Architecture
technology	O
developed	O
by	O
Digital	O
Equipment	O
Corporation	O
(	O
DEC	O
)	O
from	O
1984	O
onwards	O
.	O
</s>
<s>
A	O
variant	O
with	O
higher	O
capacity	O
is	O
called	O
Super	B-Device
DLT	I-Device
(	O
SDLT	O
)	O
.	O
</s>
<s>
In	O
2007	O
Quantum	O
stopped	O
developing	O
DLT	B-Device
drives	I-Device
,	O
shifting	O
its	O
strategy	O
to	O
LTO	B-Operating_System
.	O
</s>
<s>
DEC	O
launched	O
the	O
TK50	O
tape	O
drive	O
for	O
the	O
MicroVAX	B-Device
II	I-Device
and	O
PDP-11	B-Device
minicomputers	B-Architecture
in	O
1984	O
.	O
</s>
<s>
This	O
used	O
22-track	O
CompacTape	B-Device
I	O
cartridges	O
,	O
storing	O
94	O
MB	O
per	O
cartridge	O
.	O
</s>
<s>
The	O
TK50	O
was	O
superseded	O
in	O
1987	O
by	O
the	O
TK70	O
drive	O
and	O
the	O
48-track	O
CompacTape	B-Device
II	O
cartridge	O
,	O
capable	O
of	O
storing	O
294	O
MB	O
.	O
</s>
<s>
In	O
1989	O
,	O
the	O
CompacTape	B-Device
III	O
(	O
later	O
DLTtape	B-Device
III	O
)	O
format	O
was	O
introduced	O
,	O
increasing	O
the	O
number	O
of	O
tracks	O
to	O
128	O
and	O
capacity	O
to	O
2.6	O
GB	O
.	O
</s>
<s>
Later	O
drives	O
into	O
the	O
early	O
1990s	O
improved	O
the	O
data	O
density	O
of	O
the	O
DLTtape	B-Device
III	O
cartridge	O
,	O
up	O
to	O
10	O
GB	O
.	O
</s>
<s>
The	O
DLTtape	B-Device
IV	O
cartridge	O
was	O
introduced	O
by	O
Quantum	O
in	O
1994	O
,	O
with	O
increased	O
tape	O
length	O
and	O
data	O
density	O
,	O
initially	O
offering	O
20	O
GB	O
per	O
tape	O
.	O
</s>
<s>
Super	O
DLTtape	B-Device
,	O
originally	O
capable	O
of	O
up	O
to	O
110	O
GB	O
,	O
was	O
launched	O
in	O
2001	O
.	O
</s>
<s>
DLT7000	O
and	O
8000	O
tilt	O
the	O
head	O
forward	O
and	O
backward	O
to	O
reduce	O
crosstalk	O
between	O
adjacent	O
tracks	O
through	O
azimuth	O
;	O
this	O
is	O
called	O
Symmetric	B-General_Concept
Phase	I-General_Concept
Recording	I-General_Concept
.	O
</s>
<s>
All	O
(	O
S	O
)	O
DLT	B-Device
drives	I-Device
support	O
hardware	O
data	B-General_Concept
compression	I-General_Concept
.	O
</s>
<s>
DLT	O
includes	O
Write	B-Device
Once	I-Device
Read	I-Device
Many	I-Device
(	O
WORM	B-Device
)	O
capability	O
.	O
</s>
<s>
In	O
February	O
2007	O
,	O
Quantum	O
stopped	O
developing	O
the	O
next	O
generations	O
of	O
DLT	B-Device
drives	I-Device
(	O
S5	O
and	O
V5	O
)	O
after	O
insufficient	O
market	O
acceptance	O
of	O
the	O
S4	O
and	O
V4	O
drives	O
,	O
shifting	O
its	O
drive	O
strategy	O
to	O
LTO	B-Operating_System
.	O
</s>
<s>
DLTtape	B-Device
IV	O
can	O
support	O
both	O
DLT4000/7000/8000	O
and	O
DLT1/DLT	O
-VS80	O
for	O
full	O
functions	O
;	O
once	O
DLTtape	B-Device
IV	O
media	O
has	O
been	O
written	O
to	O
or	O
formatted	O
in	O
a	O
DLT7000/8000	O
drive	O
,	O
this	O
media	O
cannot	O
be	O
read	O
,	O
written	O
to	O
,	O
or	O
formatted	O
in	O
a	O
DLT1/DLT	O
-VS80	O
drive	O
unless	O
it	O
is	O
degaussed	O
.	O
</s>
<s>
Once	O
the	O
media	O
has	O
been	O
written	O
to	O
or	O
formatted	O
in	O
a	O
DLT4000	O
drive	O
,	O
the	O
media	O
cannot	O
be	O
written	O
to	O
or	O
formatted	O
in	O
a	O
DLT1/DLT	O
-VS80	O
drive	O
unless	O
it	O
is	O
degaussed	O
but	O
it	O
can	O
be	O
read	O
.	O
</s>
<s>
This	O
is	O
because	O
the	O
DLT1/VS	O
series	O
use	O
a	O
different	O
recording	O
format	O
that	O
is	O
not	O
fully	O
supported	O
by	O
the	O
other	O
family	O
.	O
</s>
