<s>
The	O
DataVault	B-Device
was	O
Thinking	B-Application
Machines	I-Application
 '	O
mass	B-Device
storage	I-Device
system	O
,	O
storing	O
five	O
gigabytes	O
of	O
data	O
,	O
expandable	O
to	O
ten	O
gigabytes	O
with	O
transfer	O
rates	O
of	O
40	O
megabytes	O
per	O
second	O
.	O
</s>
<s>
Eight	O
DataVaults	B-Device
could	O
be	O
operated	O
in	O
parallel	O
for	O
a	O
combined	O
data	O
transfer	O
rate	O
of	O
320	O
megabytes	O
per	O
second	O
for	O
up	O
to	O
80	O
gigabytes	O
of	O
data	O
.	O
</s>
<s>
Each	O
DataVault	B-Device
unit	O
stored	O
its	O
data	O
in	O
an	O
array	O
of	O
39	O
individual	O
disk	B-Device
drives	I-Device
with	O
data	O
spread	O
across	O
the	O
drives	O
.	O
</s>
<s>
Each	O
64-bit	O
data	O
chunk	O
received	O
from	O
the	O
I/O	B-General_Concept
bus	I-General_Concept
was	O
split	O
into	O
two	O
32-bit	O
words	O
.	O
</s>
<s>
After	O
verifying	O
parity	O
,	O
the	O
DataVault	B-Device
controller	O
added	O
7	O
bits	O
of	O
Error	B-Error_Name
Correcting	I-Error_Name
Code	I-Error_Name
(	O
ECC	O
)	O
and	O
stored	O
the	O
resulting	O
39	O
bits	O
on	O
39	O
individual	O
drives	O
.	O
</s>
<s>
The	O
ECC	O
codes	O
permit	O
100%	O
recovery	O
of	O
the	O
data	O
on	O
any	O
one	O
failed	O
disk	B-Device
,	O
allowing	O
a	O
new	O
copy	O
of	O
this	O
data	O
to	O
be	O
reconstructed	O
and	O
written	O
onto	O
the	O
replacement	O
disk	B-Device
.	O
</s>
<s>
The	O
DataVault	B-Device
was	O
an	O
example	O
of	O
unusual	O
industrial	O
design	O
.	O
</s>
