Acoustics; Table 4-6 Acoustical Characteristics—Sound Power - Quantum FIREBALL PLUS AS 10.2 Product Manual

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
minimum controller delay.
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.
4.6 4.6

ACOUSTICS

ACOUSTICS
4.6 4.6 ACOUSTICS ACOUSTICS
Table 4-6 specifies the acoustical characteristics of the Quantum Fireball Plus AS
10.2/20.5/30.0/40.0/60.0 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.
OPERATING MODE OPERATING MODE OPERATING MODE OPERATING MODE
1
Idle On Track
1
Seeking Random
Normal Mode
Quiet Mode
Note:
1. The statistical values (mean and mean +3 sigma) are determined separately for
each drive capacity. A sample lot of 30 drives is recommended for each capacity.
Table 4-6 Acoustical Characteristics—Sound Power Table 4-6 Table 4-6 Table 4-6
MEASURED SOUND MEASURED SOUND MEASURED SOUND MEASURED SOUND
POWER (MEAN) POWER (MEAN)
POWER (MEAN) POWER (MEAN)
3.0 Bels (1-Disk)
3.2 Bels (2-Disk)
3.3 Bels (3-Disk)
3.6 Bels
3.4 Bels
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT
Specifications
MEASURED SOUND MEASURED SOUND MEASURED SOUND MEASURED SOUND
POWER POWER (Mean + 3 Sigma) (Mean + 3 Sigma)
POWER POWER (Mean + 3 Sigma) (Mean + 3 Sigma)
3.3 Bels (1-Disk)
3.5 Bels (2-Disk)
3.6 Bels (3-Disk)
3.9 Bels
3.7 Bels
4-7