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3.5. Reliabilities
3.5.1. Error Rate
(1) Hard Read Error Rate (Byte Error Rate) ----- Allowing 5 Retries -----
(2) Seek Error Rate --- Allowing 5 Retries
3.5.2. MTBF
Assumptions Power On Hours
3.5.3. MTTR
3.5.4. Drive Life
(1) Load/Eject
(2) Interface connector Attach/Detach
(3) DC Power connector Attach/Detach
4. Configuration
See Figure 3 for details of the configurations
4.1. Electrical Circuits
(1) Optical Pickup and RF Amplifier Circuit
(2) Motor Drive Circuit
(3) EFM Demodulator and Error Correction Circuit
(System Control Circuit, Digital to Analog Converter)
(4) SCSI Control and CD - ROM Error Correction Circuit and SCSI I/O Interface Circuit
(5) System Control Circuit
4.2. Optical Pickup
4.3. Spindle Motor
4.4. Feed Motor
4.5. Load/Eject Motor
Mode 1:
Mode 2:
On/Off Cycles
Number of Access
Operating Duty Cycle
-15
10
Max
-12
10
Max
-6
10
Max
100,000 h
5,436 h/year
313 cycles/year
600,000 accesses/year
20 % of Power On Time
(Reading/Seeking)
0.5 h
15,000 h or 5 years (earlier one)
10,000 times or more
20 times or more
20 times or more
Semiconductor Laser and 3-beam System
Brushless DC Motor
DC Motor
DC Motor
9/27
XM-6401B Rev.1.0
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