NOTE:
1)
“new
healthy
hard
disk”
It
must
be
at
least
the
size
of
the
smallest
disk
used
when
the
set
of
RAID
disks
was
created.
Disk
with
identical
capacity
as
the
other
two
is
recommended,
with
the
best
option
of
matching
the
same
model
number
of
the
other
two
disks.
It
could
be
a
brand
new
hard
disk
bought
from
store
or
used
one
as
long
as
it
is
healthy,
could
be
either
formatted
or
unformatted,
could
have
existing
data
or
empty,
but
it
must
NEVER
be
used
by
other
RAID
device
before.
If
the
HDD
is
used
by
other
RAID
device
before,
make
sure
to
WIPE
the
last
few
sectors
of
the
HDD
where
the
RAID
information
is
stored.
****** example to wipe the last 2MB or less of a 1TB HDD that is connected to Ubuntu Linux ******
remi@ubuntu:~$ sudo dd if=/dev/zero of=/dev/sdb bs=1024 count=2048 seek=976761000
dd: writing `/dev/sdb': No space left on device (this warning is ok)
1585+0 records in
1584+0 records out
1622016 bytes (1.6 MB) copied, 1.43649 s, 1.1 MB/s
2)
“rebuild
time”
The
rebuild
time
takes
approximately
4
hours
for
three
1TB
SATA
II
disk
(e.g.
Seagate
Pipeline
HD
2)
and
2.5
hours
for
three
1TB
SATA
III
disk
(e.g.
Seagate
Pipeline
HD).
The
rebuild
time
varies
depending
on
the
SATA
disk
capacity.
3)
“data
integrity
during
rebuild”
During
the
rebuild
process,
the
data
in
the
unit
stays
as
is,
and
you
may
continue
use
the
unit.
4)
“interrupt
during
rebuild”
Only
powering
off
of
M52
can
interrupt
the
rebuild.
Unplugging
USB
cable
won't
stop
the
rebuild.
We
recommend
not
turning
the
power
off
during
the
rebuild
process.
But
if
it
is
interrupted
it
will
continue
rebuilding
the
data
as
soon
as
the
power
is
restored.
Summary of Contents for M52
Page 1: ...NAD SERVICE MANUAL M 52 M 52 Digital Music Vault Digital Music Vault ...
Page 16: ...keyboard Layout ...
Page 17: ...DCDC board layout ...
Page 18: ...SMPS board layout ...