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Introduction
There's
been a lot of attention focussed on hard drives over
the past year or so. Perceived high failure rates,
shrinking warranty periods and ever increasing capacities
have caused a certain level of anxiety and paranoia
among potential buyers, and having been on the wrong
end of a less than acceptable number of unreasonably
premature and catastrophic failures I've become as
cynical about hard drives as the users I've been chatting
to about them.
It's
far from scientific but of the dozen or so hard drive
failures I've either suffered or witnessed in the
past couple of years only one of them has been a Western
Digital unit and that was a Special Edition unit that
we gave away as a competition prize last May (2002)
which failed within a month of being put into service.
Its replacement incidentally is still going strong
though at the annoyance of the winner it was stamped
"Refurbished" across its label.
Through
hard work and innovation Western Digital have become
recognized as the driving force behind ever increasing
hard drive capacities and performance. They were the
first manufacturer to offer a mainstream drive with
an 8MB cache, a feature that was initially meant to
be nothing more than a one-off addition to a series
of "Special Edition" drives but which proved
so popular it went on to become a standard option
across most of the range, including the drive we're
examining today, the WD2000-BB, a 200GB unit built
around three 66GB platters which spin at 7200RPM.
As far as I'm aware only the 200GB unit runs on these
66GB platters with the two lower capacity drives (120GB
and 180GB) using 60GB platters.
The
WD2000-BB isn't the 8MB cache version , these have
a "JB" suffix to the model number rather
than "BB". Nor is it the optional fluid
dynamic bearing version, the benefits of which are
reduced spindle noise, reduced heat generation and
improved shock handling. It is however a cavernous
drive with enormous appeal to anybody who needs this
kind of capacity backed by one of the most respected
names in the field. Before we check out the performance
let's do the specs!
| Recommended Setup Parameters |
| Cylinders
1 |
16383 |
| Heads |
16 |
| Sectors/Track |
63 |
| Landing
Zone |
16383 |
| WPC |
16383 |
| Jumper
Setting Information |
Ten
Pin Drive |
 |
 |
| Physical Specifications |
| Formatted
Capacity 1 |
20,020
MB |
| Interface |
40-pin
EIDE |
| Actuator
Type |
Rotary
Voice Coil |
| Number
of Disks |
1 |
| Data
Surfaces |
2 |
| Number
of Heads |
2 |
| Bytes
Per Sector |
512 |
| User
Sectors Per Drive |
39,102,336 |
| Servo
Type |
Embedded |
| Recording
Method EPR4 |
Rate
16/17 PRML |
| ECC |
Reed
Solomon |
| Head
Park 2 |
Automatic |
|
| Performance Specifications |
Average
Seek
- Read
- Write |
8.9
ms (average)
10.9 ms (average) |
| Track-to-Track
Seek |
2.0
ms (average) |
| Full
Stroke Seek |
21
ms (average) |
| Index
Pulse Period |
8.3
ms (nominal) |
| Average
Latency |
4.2
ms (nominal) |
| Rotational
Speed |
7200
RPM (nominal) |
| Controller
Overhead |
0.3
ms average |
Data
Transfer Rate (maximum)
- Buffer to Host
- Buffer to Disk |
100 MB/s (Mode 5 Ultra ATA)
66.6 MB/s (Mode 4 Ultra ATA)
33.3 MB/s (Mode 2 Ultra ATA)
16.6 MB/s (Mode 4 PIO)
16.6 MB/s (Mode 2 multi-word DMA)
400 Mbits/s maximum |
| Interleave |
1:1 |
| Buffer
Size |
2
MB |
| Error
Rate - Unrecoverable |
<1
in 1014 bits read |
Spindle
Start Time
- From Power-on to Drive Ready 1
- From Power-on to Rotational Speed 2 |
6.0
s average
4.5 s average |
| Contact
Start/Stop Cycles (CSS) |
50,000
minimum |
|
| Physical Dimensions |
| Height |
English: |
1.028
inches max |
| |
Metric: |
26.1
mm max |
| Length |
English: |
5.787
inches max |
| |
Metric: |
147.0
mm max |
| Width |
English: |
4.00
inches ±0.010 inch |
| |
Metric: |
101.6
mm ±0.25 mm |
| Weight |
English: |
1.4
pounds ±0.14 pounds |
| |
Metric: |
0.62
kg ±0.062 kg |
|
| Electrical Specifications |
| Current
Requirements and Power Dissipation |
| Operating
Mode |
RMS
Current |
Power,
Typical 1 |
| |
12
VDC |
5
VDC |
|
| Spinup |
2.2
A |
525
mA |
17.0
W |
| Read/Write/Idle |
350
mA |
800
mA |
8.0
W |
| Seek |
900
mA |
675
mA |
14.0
W |
| Power
Management Commands |
| Operating
Mode |
RMS
Current 1 |
Power,
Typical 1 |
| |
12
VDC |
5
VDC |
|
| Idle
(E1H) |
330
mA |
675
mA |
7.25
W |
| Standby
(E0H) |
20
mA |
200
mA |
1.25
W |
| Sleep
(E6H) |
20
mA |
50
mA |
0.5
W |
| Input
Voltage Requirements |
| +5.0V
(±5%) and 12.0V (±10%) |
| Ripple |
| |
+12
VDC |
+5
VDC |
Maximum
Frequency |
200
mV (double amplitude)
0-30 MHz |
100
mV (double amplitude)
0-30 MHz |
| Power
Connectors and Cables |
| Power
Connector |
4-pin
AMP (P/N 84069-1 or equivalent) |
| Mating
Connector |
Body
(AMP 1-480424-0 or equivalent)
Pins (AMP 60619-4 or equivalent) |
| Power
Cable Wire gauge |
18
AWG (or heavier) |
1
All values are typical (25°C, 5.0V, and 12V
input) except where specified as maximum.
Note:
Current measurements cut off frequency at
1 kHz.
|
| Environmental Specifications |
| Shock
1 |
| Operating |
65
G, 2 ms (read); 20 G, 2 ms (write) |
| Non-operating |
250
G, 2 ms |
| Vibration |
| Operating |
Linear:
5-500 Hz, 0.25 G (0 to peak)
Random: 10-300 Hz, 0.004 g2/Hz |
| Non-operating |
5-20
Hz, 0.195 inches (double amplitude)
20-500 Hz, 4.0 G (0 to peak) |
| Sweep
Rate |
0.5
octave/minute minimum |
| Drive
Generated Vibration |
| Operating |
0.4
gm-mm typical with the drive in an unconstrained
condition |
| Rotational
Shock Non-Operating |
| Amplitude |
20
K rad/sec2 |
| Duration |
2
ms |
| Operating
Temperature and Humidity |
| Temperature |
5°C
to 55°C (41°F to 131°F)
5°C to 65°C (case temp) |
| Humidity |
5-85%
RH non-condensing
33°C (maximum wet bulb) |
| Thermal
Gradient |
20°C/hour
(maximum) |
| Humidity
Gradient |
20%/hour
(maximum) |
| Non-Operating
Temperature and Humidity |
| Temperature |
-40°C
to 60°C (-40°F to 140°F) |
| Humidity |
5-95%
RH non-condensing
33°C (maximum wet bulb) |
| Thermal
Gradient |
30°C/hour
(maximum) |
| Humidity
Gradient |
20%/hour
(maximum) |
| Altitude |
| Operating |
-1000
feet to 10,000 feet (-305M to 3,050M) |
| Non-Operating |
-1000
feet to 40,000 feet (-305M to 12,200M) |
| Acoustics |
| Idle
Mode 2 |
35
dBA average |
| Seek
Mode 0 3 |
38
dBA average |
| Seek
Mode 3 3 |
35
dBA average |
| Reliability
Specifications |
| AFR |
<0.8% |
| MTBF |
500,000
Power On Hours |
| Component
Design Life |
5
years |
| Warranty
Period |
1
year 4 |
Although
it's reassuring to see a five year component design
life, it's still a matter of concern to me that the
warranty offered is only twelve months. The optional
8MB cache version of this drive (WD2000-JB) comes
with the previously standard three year warranty so
depending on your needs this might be worth considering.
Alternatively, you can purchase an extended warranty
from WD HERE
at a cost of $14.95 for an additional two years.
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