Deskstar (DALS-3540 SCSI-2 Fast)
Product description |
Features |
| |
- 541MB formatted capacity (512 byte/sector)
- 10MB/s data transfer speed
- 48.7Mb/s (OD) media data rate
- 32.2Mb/s (ID) media data rate
- Average seek time 12ms (Read)
- 4500 RPM
- 64KB segmented buffer
- Read ahead caching with LFU (Least frequently used) segment update
- Industry standard mounting
- The drive can be mounted with any of its six surfaces facing down
- Advanced ECC on the fly
- Power saving modes
- Robust design for EMC/RFI
- MR (Magneto Resistive) head technology
- No-ID sector format
|
| |
| Operating environment |
Operating conditions |
| Temperature |
5
to 55 degrees C* |
| Relative
Humidity |
8
to 90% non-condensing |
| Maximum
Wet Bulb Temperature |
29.4
degrees C non-condensing |
| Maximum
Temperature Gradient |
15
C/Hour |
| Altitude |
-300
to 3048m |
|
Non operating conditions |
| Temperature |
-40
to 65 degrees C |
| Relative
Humidity |
5
to 95% non-condensing |
| Maximum
Wet Bulb Temperature |
35
degrees C non-condensing |
| Maximum
Temperature Gradient |
15
C/Hour |
| Altitude |
-300
to 12,000m |
|
Note: The system is
responsible to provide sufficient air movement to maintain surface
temperature below 60 C at the center of top cover of the drive. |
Operating shock |
The hard disk drive meets the following
criteria while operating in respective conditions described below.
The shock test consists of five shocks inputs in each axis and
direction for total of 30. There must be a delay between shock
pulses, long enough to allow the drive to complete all necessary
error recovery procedure. |
No errors
5G, 11 ms half-sine shock pulse
No data loss, seek error or
permanent damage
10G 11 ms half-sine shock pulse
No data loss, or permanent damage
15 G, 5 ms half-sine shock pulse
30 G, 4 ms half-sine shock pulse |
Operating vibration |
Due to the complexity of this subject we
recommend that users contact the IBM technical Support Group
representative to discuss how to perform the necessary measurements
if they believe this to be an area which requires evaluation. |
DC power requirements |
The following voltage specifications
apply at the drive power connector. Damage to the drive electronics
may result if the power supply cable is connected or disconnected
while power is being applied to the drive (No hot plug/unplug is
allowed). There are inductive loads in the drive which could cause
destructively high voltage spikes on the drive if the power
connection is opened. There is no special power on/off sequencing
required. |
| Nominal
Supply Voltages |
+5 |
+12 |
Power
Supply Ripple
{mV}(0-10{Mhz}P-P) |
100
max |
150
max |
Voltage
Supply Tolerance
(including ripple) |
+/-5% |
+10%/-8% |
Power Supply Current |
|
|
|
Start up (Peak) |
0.51A |
1.16A |
|
Idle (average) |
0.23A |
0.12A |
|
R/W (average) |
0.57A |
0.14A |
|
Seek (average) |
0.41A |
0.27A |
|
Standby |
0.20A |
0.01A |
|
During the drive start up and seeking,
12 volt ripple is generated by the drive (referred to as dynamic
loading). If several drives have their power daisy chained together
then the power supply ripple plus other drive's dynamic loading must
remain within the regulation tolerance of +10/-8%. A common supply
with separate power leads to each drive is a more desirable method
of power distribution.
To prevent external electrical noise
from interfering with the drive's performance, the drive must be
held by four screws in a user system frame which has no electrical
level deference at the four screws position, and has less than
+/-300 millivolts peak to peak level deference to the drive power
connector ground. |
|
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