Deskstar 5
Product description
Models: DHEA-36480 and DHEA-34330
Features
- PIO and DMA data transfer modes
- 476 KB adaptive sector buffer
- Industry standard mounting
- Advanced ECC on the fly (EOF)
- CHS and LBA addressing modes
- Power saving modes
- Robust design for EMC/RFI
- MR (magneto resistive) head technology
- No ID sector format
- S.M.A.R.T. function support
Environmental characteristics
| Operating conditions |
| Temperature |
5 to 55 oC 1 |
| Relative humidity |
8 to 90% non-condensing |
| Maximum wet bulb temperature |
29.4 oC non-condensing |
| Gradient maximum temperature |
15 oC/hour |
| Altitude |
-300 to 3,048 m |
| Non operating conditions |
| Temperature |
-40 to 65 oC 1 |
| Relative humidity |
5 to 95% non-condensing |
| Maximum wet bulb temperature |
35 oC non-condensing |
| Altitude |
-300 to 12,000 m |
1The system is responsible for providing sufficient air movement to maintain surface temperature below 60 degrees C at the center of the top cover of the drive.
Operating shock
The hard disk drive will meet the following criteria while operating in the respective conditions described below. There must be a delay between shock pulses, long
enough to allow the drive to complete all necessary error recovery procedures.
| Criteria |
Condition |
| No errors |
5 G, 11 ms half-sine shock pulse |
| No data loss, seek errors or permanent damage |
10 G, 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 |
Non operating shock
The drive will withstand without damage or degradation of performance, a 75 G half-sine wave shock pulse of 11 ms duration when
heads are parked. When power is not applied to the unit, the heads are automatically located in the parked position. The above
specification is for shocks applied in each direction of the drives' three mutually perpendicular axis, one axis at a time.
Operating vibration
Due to the complexity of this subject we recommend that users contact support to discuss how to perform the necessary measurements.
DC power requirement
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 is
no special power on/off sequencing required.
| Input voltage |
| +5 volts supply |
5V (+/-5% during run and spin up) |
| +12 volts supply |
12V (+10%, -8% during run and spin up) |
Power supply current
| Current (Amps) |
+5 volts pop mean |
+12 volts pop mean |
| Idle average |
0.32 |
0.26 |
| Idle ripple (peak to peak) |
0.20 |
0.48 |
| Seek peak 1 |
0.44 |
1.40 |
| Seek average 1 |
0.30 |
0.50 |
| Start up (max) |
0.60 |
2.00 |
| Random R/W peak 2 |
0.70 |
1.40 |
| Random R/W average 2 |
0.36 |
0.39 |
| Stanby/sleep average |
0.13 |
0.002 |
Notes:
- Random seeks at 40% duty cycle.
- Seek duty = 30%, W/R duty = 45%, idle duty = 25%.
Power supply generated ripple
| Supply |
Maximum |
Notes |
| +5V DC |
100 mV pp |
0-10 MHz |
| +12V DC |
150 mV pp |
0-10 MHz |
During 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 the ripple from
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 difference at the four screws position, and has less than
+/-300 mV peak to peak level difference to the drive's power connector ground.
|
