Maxtor STM3320820AS ユーザーズマニュアル
DiamondMax 21 Serial ATA Product Manual, Rev. C
25
2.10
Acoustics
Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea-
surements are consistent with ISO document 7779. Sound power measurements are taken under essentially
free-field conditions over a reflecting plane. For all tests, the drive is oriented with the cover facing upward.
surements are consistent with ISO document 7779. Sound power measurements are taken under essentially
free-field conditions over a reflecting plane. For all tests, the drive is oriented with the cover facing upward.
Note. For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is defined
by the following equation:
(Number of seeks per second = 0.4 / (average latency + average access time)
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and
power to operational levels.
**Measured in performance mode.
***Measured in quiet mode.
2.11
Electromagnetic immunity
When properly installed in a representative host system, the drive operates without errors or degradation in
performance when subjected to the radio frequency (RF) environments defined in the following table:
performance when subjected to the radio frequency (RF) environments defined in the following table:
Table 8:
Fluid Dynamic Bearing (FDB) motor acoustics
Idle*
Seek
STM3500630AS
2.8 bels (typ)
3.0 bels (max)
3.7 bels (typ)**
3.9 bels (max)**
STM3320620AS, STM3320820AS, and STM3250820AS
2.5 bels (typ)
2.9 bels (max)
3.0 bels (typ)**
3.2 bels (max)**
STM3250824AS
2.7 bels (typ)
2.9 bels (max)
3.4 bels (typ)**
3.6 bels (max)**
STM3250310AS
2.6 bels (typ)
2.7 bels (max)
2.7 bels (typ)***
2.8 bels (max)***
STM3160815AS, STM3160215AS, STM380815AS
STM380215AS and STM340215AS
2.8 bels (typ)
3.0 bels (max)
3.0 bels (typ)***
3.2 bels (max)***
Table 9:
Radio frequency environments
Test
Description
Performance level
Reference standard
Electrostatic
discharge
discharge
Contact, HCP, VCP: ± 4
kV; Air:
± 8 kV
B
EN 61000-4-2: 95
Radiated RF
immunity
immunity
80 to 1,000 MHz, 3 V/m,
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
A
EN 61000-4-3: 96
ENV 50204: 95
Electrical fast
transient
transient
± 1 kV on AC mains, ± 0.5 kV on external I/O
B
EN 61000-4-4: 95
Surge immunity
± 1 kV differential, ± 2 kV common, AC mains
B
EN 61000-4-5: 95
Conducted RF
immunity
immunity
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine A
EN 61000-4-6: 97
Voltage dips,
interrupts
interrupts
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
C
C
C
B
EN 61000-4-11: 94