<s>
In	O
computer	B-General_Concept
data	I-General_Concept
storage	I-General_Concept
,	O
Smart	B-Device
Response	I-Device
Technology	I-Device
(	O
SRT	O
,	O
also	O
called	O
SSD	B-Device
Caching	I-Device
before	O
it	O
was	O
launched	O
)	O
is	O
a	O
proprietary	O
caching	B-General_Concept
mechanism	I-General_Concept
introduced	O
in	O
2011	O
by	O
Intel	O
for	O
their	O
Z68	O
chipset	B-Device
(	O
for	O
the	O
Sandy	O
Bridgeseries	O
processors	O
)	O
,	O
which	O
allows	O
a	O
SATA	O
solid-state	B-Device
drive	I-Device
(	O
SSD	B-Device
)	O
to	O
function	O
as	O
cache	B-General_Concept
for	O
a	O
(	O
conventional	O
,	O
magnetic	O
)	O
hard	B-Device
disk	I-Device
drive	I-Device
(	O
HDD	O
)	O
.	O
</s>
<s>
SRT	O
is	O
managed	O
by	O
Intel	B-Application
Rapid	I-Application
Storage	I-Application
Technology	I-Application
software	O
version	O
10.5	O
or	O
later	O
,	O
and	O
implemented	O
both	O
in	O
its	O
device	B-Application
driver	I-Application
and	O
in	O
the	O
Z68	O
motherboard	B-Device
's	O
firmware	B-Application
(	O
option	B-Device
ROM	I-Device
)	O
.	O
</s>
<s>
It	O
is	O
available	O
only	O
when	O
the	O
(	O
integrated	O
)	O
disk	O
controller	O
is	O
configured	O
in	O
RAID	B-Architecture
mode	O
(	O
but	O
not	O
AHCI	O
or	O
IDE	B-Protocol
modes	O
)	O
by	O
implementing	O
a	O
style	O
of	O
RAID0	O
striping	O
.	O
</s>
<s>
The	O
user	O
can	O
select	O
write-back	O
(	O
so-called	O
maximized	O
mode	O
)	O
or	O
write-through	O
(	O
so-called	O
enhanced	O
mode	O
)	O
caching	B-General_Concept
strategy	O
.	O
</s>
<s>
The	O
maximum	O
utilizable	O
cache	B-General_Concept
size	O
on	O
the	O
SSD	B-Device
is	O
64GB	O
.	O
</s>
<s>
Caching	B-General_Concept
is	O
done	O
at	O
the	O
logical	B-Device
block	I-Device
addressing	I-Device
(	O
LBA	O
)	O
level	O
,	O
not	O
the	O
file	O
level	O
.	O
</s>
<s>
Shortly	O
before	O
the	O
announcement	O
of	O
the	O
new	O
chipset	B-Device
,	O
Intel	O
also	O
introduced	O
the	O
Intel	O
311	O
(	O
Larson	O
Creek	O
)	O
,	O
a	O
20GB	O
single-level	O
cell	O
(	O
SLC	O
)	O
solid-state	B-Device
drive	I-Device
,	O
which	O
it	O
markets	O
as	O
suitable	O
for	O
caching	B-General_Concept
.	O
</s>
<s>
,	O
TRIM	O
garbage	O
collection	O
is	O
not	O
supported	O
for	O
SRT	O
caching	B-General_Concept
devices	O
,	O
so	O
the	O
SSD	B-Device
's	O
performance	O
is	O
solely	O
maintained	O
by	O
its	O
own	O
firmware	B-Application
.	O
</s>
<s>
With	O
the	O
release	O
of	O
Ivy	O
Bridge	O
chipsets	B-Device
,	O
support	O
for	O
SRT	O
was	O
provided	O
in	O
a	O
larger	O
variety	O
of	O
desktop	O
chipsets	B-Device
,	O
including	O
Z77	O
,	O
Q77	O
and	O
H77	O
(	O
but	O
not	O
Z75	O
,	O
Q75	O
or	O
B75	O
)	O
as	O
long	O
as	O
an	O
"	O
Intel	O
Core	O
Processor	O
"	O
is	O
used	O
.	O
</s>
<s>
The	O
situation	O
is	O
similar	O
for	O
Haswell	B-Device
desktop	I-Device
chipsets	I-Device
,	O
with	O
Z87	B-Device
,	O
Q87	O
and	O
H87	O
listed	O
as	O
supported	O
.	O
</s>
<s>
The	O
Ivy	B-Device
Bridge-E	I-Device
chipset	B-Device
X79	B-Device
did	O
not	O
officially	O
support	O
SRT	O
at	O
launch	O
,	O
but	O
some	O
companies	O
like	O
ASRock	O
added	O
support	O
to	O
their	O
boards	O
via	O
BIOS	O
updates	O
.	O
</s>
<s>
The	O
arrival	O
of	O
Ivy	O
Bridge	O
also	O
saw	O
SRT	O
support	O
added	O
to	O
mobile	O
chipsets	B-Device
:	O
QS77	O
,	O
QM77	O
,	O
UM77	O
and	O
HM77	O
support	O
SRT	O
,	O
while	O
HM76	O
does	O
not	O
.	O
</s>
<s>
In	O
2012	O
,	O
Intel	O
also	O
introduced	O
the	O
313	O
(	O
Hawley	O
Creek	O
)	O
caching	B-General_Concept
SSD	B-Device
series	O
(	O
20	O
and	O
24GB	O
)	O
,	O
advertised	O
as	O
also	O
suitable	O
for	O
use	O
in	O
Ultrabooks	B-Device
.	O
</s>
<s>
,	O
SRT	O
was	O
limited	O
to	O
using	O
at	O
most	O
64GB	O
for	O
caching	B-General_Concept
,	O
meaning	O
that	O
on	O
larger	O
SSDs	B-Device
the	O
rest	O
remains	O
unused	O
by	O
the	O
cache	B-General_Concept
.	O
</s>
<s>
The	O
chipset	B-Device
exposes	O
any	O
excess	O
storage	O
space	O
as	O
a	O
separate	O
independent	O
disk	O
,	O
which	O
can	O
be	O
used	O
for	O
other	O
purposes	O
.	O
</s>
<s>
In	O
2014	O
,	O
Intel	O
has	O
updated	O
the	O
SRT	O
supported	O
chipset	B-Device
list	O
,	O
to	O
include	O
the	O
as	O
well	O
.	O
</s>
<s>
Next	O
year	O
,	O
support	O
was	O
n't	O
added	O
for	O
succeeding	O
Z170	O
and	O
H170	O
Skylake	O
generation	O
chipsets	B-Device
.	O
</s>
<s>
It	O
required	O
Kaby	O
Lake	O
processors	O
and	O
chipsets	B-Device
with	O
intel	O
citing	O
better	O
performance	O
over	O
SRT	O
.	O
</s>
<s>
This	O
new	O
SSD	B-Device
caching	I-Device
method	O
left	O
Z170/H170	O
chips	O
and	O
skylake	O
processors	O
without	O
any	O
kind	O
of	O
SSD	B-Device
caching	I-Device
available	O
.	O
</s>
