Acomdata PHD320UHE-54 External Hard Drive PHD320UHE-54 用户手册
产品代码
PHD320UHE-54
10
B
It
- t
he
bAsic
unit
of
binArY
dAtA
,
repre
-
sented
logicAllY
As
A
1
or
A
0.
B
us
– A
n
electronic
link
thAt
cAn
conVeY
dAtA
between
deVices
,
such
As
computers
And
peripherAls
.
B
yte
– A
bAsic
unit
of
digitAl
dAtA
,
usuAllY
mAde
up
of
eight
bits
(
octet
). A
bYte
holds
the
equiVAlent
of
A
single
chArActer
,
such
As
the
letter
A. s
torAge
cApAcitY
is
meAsured
in
bYtes
,
kilobYtes
(kb),
megAbYtes
(mb),
gigA
-
bYtes
(gb)
etc
.
c
ache
– A
memorY
buffer
thAt
stores
fre
-
quentlY
used
disk
dAtA
in
rAm
so
the
dAtA
cAn
be
reAd
At
A
fAster
rAte
thAn
if
Accessed
from
the
disk
.
D
evIce
D
rIver
– A
softwAre
progrAm
thAt
enAbles
A
computer
to
communicAte
with
peripherAl
deVices
,
such
As
hArd
driVes
And
cd-rom
driVes
. e
Ach
tYpe
of
deVice
requires
A
different
driVer
.
F
Ile
s
ystem
– t
he
method
for
storing
And
retrieVing
files
on
A
disk
. A
file
sYstem
defines
the
directorY
structure
for
keeping
trAck
of
the
files
And
the
pAth
sYntAx
required
to
Access
them
. i
t
Also
defines
the
wAY
files
Are
nAmed
As
well
As
the
mAximum
size
of
A
file
or
Volume
. fAt32
And
ntfs
Are
file
sYstems
used
on
pc
s
; hfs
is
common
on
m
Acs
.
G
IGaByte
– 1,024
megAbYtes
(
binArY
); 1,000
megAbYtes
(
decimAl
),
or
ApproximAtelY
one
billion
bYtes
.
h
uB
– A
deVice
which
links
peripherAls
onto
the
sAme
dAtA
bus
.
m
BPs
(m
eGaBIts
Per
seconD
) – A
meAsure
-
ment
of
dAtA
trAnsmission
speed
. f
or
dAtA
trAnsmissions
,
the
bAse
unit
is
the
bit
rAther
thAn
the
bYte
. u
sing
bits
is
A
truer
meAsure
of
rAw
performAnce
becAuse
it
negAtes
the
need
to
differentiAte
between
the
pArt
of
the
dAtA
streAm
thAt
mAkes
up
the
file
(
s
)
being
sent
And
the
AccompAnYing
dAtA
protocols
thAt
structure
And
goVern
dAtA
communicA
-
tions
.
mB (m
eGaByte
) – 1,048,576
bYtes
(
binArY
);
1,000,000
bYtes
(
decimAl
).
P
artItIon
– A
fixed
Amount
of
reserVed
storAge
spAce
on
A
hArd
disk
. A
disk
cAn
con
-
tAin
one
or
more
pArtitions
. A
pArtition
must
be
formAtted
with
A
compAtible
file
sYstem
in
order
to
mount
to
A
giVen
operAting
sYstem
.
A
mounted
pArtition
is
treAted
As
A
discrete
Volume
.
s
tartuP
D
Isk
– t
he
disk
from
which
A
com
-
puter
loAds
its
operAting
sYstem
. A
lso
cAlled
A
"
boot
Volume
."
v
olume
– A
formAtted
hArd
driVe
pArtition
.
t
he
term
"
Volume
"
is
often
used
As
A
sYnonYm
for
the
hArd
driVe
itself
when
the
driVe
con
-
tAins
A
single
pArtition
. h
oweVer
,
it
is
possible
for
A
hArd
driVe
to
contAin
more
thAn
one
Volume
,
or
for
A
single
Volume
to
spAn
more
thAn
one
hArd
driVe
.
Glossary