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4-8 Maxtor D540X-4K 20.4/40.0/60.0/80.0 GB AT
3. Idle mode is in effect when the drive is not reading, writing, seeking, or executing
any commands. A portion of the R/W circuitry is powered down, the motor is
up to speed and the Drive Ready condition exists.
4. Maximum seeking is defined as continuous random seek operations with typical
host command overhead.
5. Standby mode is defined as when the motor is stopped, the actuator is parked, and
all electronics except the interface control are in low power state. Standby occurs
after a programmable time-out after the last host access. Drive ready and seek
complete status exist. The drive leaves standby upon receipt of a command that
requires disk access or upon receiving a spinup command.
6. Read/Write On Track is defined as 50% read operations and 50% write
operations on a single physical track.
Table 4-6 specifies the acoustical characteristics of the Maxtor D540X-4K 20.4/40.0/
60.0/80.0 GB AT hard disk drive. The acoustics are measured in an anechoic chamber
with background noise at least <10dBA less than the expected sound pressure Lp(A).
To distinguish between sound power and sound pressure standards, sound power
Lw(A) is specified in Bels. The relationship between bels and dBA for sound power is
1 bel = 10dBA.
Acoustical Characteristics—Sound Power
Idle On Track
20.4/40.0 GB AT (1-Disk)
60.0/80.0 GB GB AT (2-Disk)
Seeking Random
20.4/40.0 GB AT (1-Disk)
60.0/80.0 GB AT (2-Disk)
2.8 Bels
2.9 Bels
2.9 Bels
3.1 Bels
3.4 Bels
3.5 Bels
3.4 Bels
3.6 Bels