<s>
MK-DOS	B-Device
was	O
one	O
of	O
the	O
most	O
widespread	O
operating	B-General_Concept
systems	I-General_Concept
for	O
Elektronika	B-Device
BK	I-Device
personal	O
computers	O
,	O
developed	O
by	O
Mikhail	O
Korolev	O
and	O
Dmitriy	O
Butyrskiy	O
from	O
1993	O
.	O
</s>
<s>
Like	O
ANDOS	B-Device
,	O
the	O
system	O
provided	O
full	O
compatibility	O
for	O
all	O
models	O
,	O
emulating	O
the	O
BK-0010	B-Device
environments	O
on	O
the	O
more	O
modern	O
BK-0011	O
and	O
BK-0011M	O
machines	O
.	O
</s>
<s>
The	O
system	O
supported	O
up	O
to	O
4	O
physical	O
disk	O
drives	O
(	O
the	O
actual	O
number	O
was	O
limited	O
by	O
the	O
disk	O
ROM	O
installed	O
)	O
and	O
as	O
many	O
hard	B-Application
disk	I-Application
partitions	I-Application
as	O
the	O
number	O
of	O
letters	O
in	O
the	O
Latin	O
alphabet	O
,	O
which	O
could	O
be	O
used	O
as	O
separate	O
logical	B-Application
drives	I-Application
,	O
each	O
with	O
a	O
volume	O
of	O
up	O
to	O
32	O
MB	O
.	O
</s>
<s>
Starting	O
from	O
version	O
3.0	O
the	O
system	O
also	O
supported	O
mounting	O
disk	O
images	O
as	O
logical	B-Application
drives	I-Application
.	O
</s>
<s>
When	O
booted	O
on	O
a	O
BK-0011	O
or	O
BK-0011M	O
the	O
system	O
automatically	O
created	O
a	O
RAM	B-Application
disk	I-Application
in	O
the	O
computer	O
's	O
memory	O
.	O
</s>
<s>
The	O
most	O
widespread	O
file	B-Application
system	I-Application
along	O
MK-DOS	B-Device
users	O
was	O
MicroDOS	O
.	O
</s>
<s>
It	O
did	O
not	O
support	O
file	B-Architecture
fragmentation	I-Architecture
(	O
like	O
the	O
file	B-Application
system	I-Application
used	O
with	O
RT-11	B-Operating_System
)	O
and	O
required	O
frequent	O
spatial	O
reallocation	O
to	O
maintain	O
optimum	O
contiguous	O
free	O
space	O
(	O
RT-11	B-Operating_System
users	O
would	O
use	O
the	O
'	O
SQUEEZE	O
 '	O
command	O
,	O
which	O
worked	O
the	O
same	O
way	O
as	O
the	O
*	O
COMPACT	O
command	O
on	O
Acorn	O
's	O
DFS	B-Application
for	O
the	O
BBC	B-Device
Micro	I-Device
)	O
.	O
</s>
<s>
Although	O
MK-DOS	B-Device
was	O
incompatible	O
with	O
the	O
RT-11	B-Operating_System
'	O
s	O
file	B-Application
system	I-Application
,	O
both	O
shared	O
many	O
principles	O
.	O
</s>
<s>
MicroDOS	O
 '	O
file	B-Application
system	I-Application
had	O
read-only	O
support	O
in	O
ANDOS	B-Device
.	O
</s>
<s>
It	O
had	O
a	O
functional	O
Norton	O
Commander-like	O
file	B-Application
manager	I-Application
called	O
MCommander	O
.	O
</s>
<s>
It	O
also	O
shipped	O
with	O
a	O
number	O
of	O
utilities	O
including	O
drivers	O
for	O
the	O
RT-11	B-Operating_System
,	O
FAT12	B-Application
and	O
CSI-DOS	O
file	B-Application
systems	I-Application
as	O
add-ons	O
for	O
the	O
file	B-Application
manager	I-Application
.	O
</s>
