<s>
CHFS	B-Application
is	O
a	O
file	B-Application
system	I-Application
developed	O
at	O
the	O
Department	O
of	O
Software	O
Engineering	O
,	O
University	O
of	O
Szeged	O
,	O
Hungary	O
.	O
</s>
<s>
It	O
was	O
the	O
first	O
open	O
source	O
flash	O
memory-specific	O
file	B-Application
system	I-Application
written	O
for	O
the	O
NetBSD	B-Device
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Intended	O
usage	O
is	O
over	O
raw	O
flash	O
devices	O
on	O
embedded	B-Architecture
systems	I-Architecture
like	O
ARM	B-Architecture
and	O
MIPS	B-Device
,	O
the	O
filesystem	B-Application
is	O
less	O
suitable	O
for	O
use	O
on	O
consumer	O
SSD	B-Device
(	O
because	O
consumer	O
SSDs	B-Device
already	O
make	O
sure	O
to	O
not	O
use	O
the	O
same	O
physical	O
blocks	O
for	O
writing	O
modified	O
data	O
)	O
.	O
</s>
<s>
Similar	O
to	O
UBIFS	B-Application
,	O
the	O
CHFS	B-Application
file	B-Application
system	I-Application
utilizes	O
a	O
separate	O
layer	O
for	O
handling	O
Flash	O
aging	O
and	O
bad	O
blocks	O
,	O
called	O
EBH	O
(	O
erase	O
block	O
handler	O
)	O
.	O
</s>
<s>
The	O
file	B-Application
system	I-Application
itself	O
is	O
modelled	O
after	O
JFFS2	B-Application
,	O
thus	O
the	O
internal	O
structure	O
is	O
very	O
similar	O
.	O
</s>
<s>
CHFS	B-Application
was	O
originally	O
called	O
ChewieFS	O
during	O
development	O
.	O
</s>
