IBM IC35L020 Hard Drive Specifications - Page 64

Reliability, Energy consumption efficiency, 4.1 Data integrity, 4.2 Cable noise interference

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9.3.5 Energy consumption efficiency Model by capacity in GB 10 20 30 40 50 60 Energy consumption efficiency (W/GB) 0.67 0.34 0.22 0.17 0.13 0.11 Figure 49. Energy consumption efficiency Energy consumption efficiency is calculated as power consumption at idle average. The unit of measure for the energy consumption efficiency is given in Watt/Gigabyte (W/GB). 9.4 Reliability 9.4.1 Data integrity No more than one sector is lost at a power loss condition during a write operation when the write cache option is disabled. If the write cache option is active, then the data in the write cache will be lost. To prevent drive data loss it is recommended that the last write access before power off be issued after setting the write cache to off. 9.4.2 Cable noise interference To avoid any degradation of performance throughput or error rate when the interface cable is routed on top of or comes in contact with the hard disk assembly, the drive must be grounded electrically to the system frame by four drive mounting screws. The common mode noise or voltage level difference between the system frame and power cable ground or AT interface cable ground must be in the allowable level specified in the Section 9.3 "DC Power Requirements" on page 48. 9.4.3 Start/stop cycles The drive withstands a minimum of 40,000 start/stop cycle under a 40°C environment and a minimum of 10,000 start/stop cycle under any other extreme temperature or humidity environment within the operating range (refer to Section 9.2.1 on page 47). 9.4.4 Life Expected product life is 5 years under typical desktop PC usage conditions: O 333 Power-On Hours (POH) per month. O Seeking/writing/reading operation to be 20% of POH at 40°C or lower environmental temperature. 9.4.5 Preventive maintenance None. Deskstar 60 GXP Hard disk drive specification 50

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9.3.5
Energy consumption efficiency
0.11
60
0.13
50
0.17
40
0.22
30
0.34
20
0.67
10
Energy consumption
efficiency (W/GB)
Model by capacity in GB
Figure
49.
Energy consumption efficiency
Energy consumption efficiency is calculated as power consumption at idle average. The unit of measure
for the energy consumption efficiency is given in Watt/Gigabyte (W/GB).
9.4 Reliability
9.4.1 Data integrity
No more than one sector is lost at a power loss condition during a write operation when the write cache
option is disabled. If the write cache option is active, then the data in the write cache will be lost. To
prevent drive data loss it is recommended that the last write access before power off be issued after
setting the write cache to off.
9.4.2 Cable noise interference
To avoid any degradation of performance throughput or error rate when the interface cable is routed on
top of or comes in contact with the hard disk assembly, the drive must be grounded electrically to the
system frame by four drive mounting screws. The common mode noise or voltage level difference
between the system frame and power cable ground or AT interface cable ground must be in the allowable
level specified in the Section 9.3 "DC Power Requirements" on page 48.
9.4.3 Start/stop cycles
The drive withstands a minimum of 40,000 start/stop cycle under a 40°C environment and a minimum of
10,000 start/stop cycle under any other extreme temperature or humidity environment within the
operating range (refer to Section 9.2.1 on page 47).
9.4.4 Life
Expected product life is 5 years under typical desktop PC usage conditions:
333 Power-On Hours (POH) per month.
Seeking/writing/reading operation to be 20% of POH at 40°C or lower environmental temperature.
9.4.5 Preventive maintenance
None.
Deskstar
60 GXP Hard disk drive specification
50