Medium Optical Disk (RW551/RW552) Library
vi
EK–MOL80–SV. B01
6 Theory of Operation (
continued
)
DSP (Digital Signal Processor)....................................................................... 6–17
Read/Write Channel Electronics .............................................................. 6–17
Loading Motor ......................................................................................... 6–18
Bias Magnet............................................................................................. 6–18
Optical Head............................................................................................ 6–18
Optical Disk Layout and Error Correction ...................................................... 6–18
Disk Formats............................................................................................ 6–18
Optical Disk Layout................................................................................. 6–19
User Zone Layout .................................................................................... 6–19
650–Mbyte Disk and Spare Groups .......................................................... 6–20
1.3–Gbyte Disk User and Spare Groups ................................................... 6–20
2.6 Gbyte Disk User and Spare Groups .................................................... 6–20
Drive Defect Management................................................................................ 6–32
Slip Sparing Algorithm..................................................................................... 6–33
Replacement Sparing Algorithm....................................................................... 6–34
Error Thresholds............................................................................................... 6–34
Diagnostic Strategy .......................................................................................... 6–35
Internal Autochanger Diagnostics ............................................................ 6–35
The SCSI Interface ................................................................................... 6–35
Single–Ended and Differential SCSI Interfaces ........................................ 6–36
SCSI Command Set .......................................................................................... 6–37
Appendix A Basic Supplies and Reorderable Parts
Basic Supplies & Reorderable Parts................................................................... A–1
Related Documents............................................................................................ A–2
Figures
1–1
RW551 & RW552 Jukebox ...................................................................... 1–1
2–1
Clearance Requirements........................................................................... 2–1
2–2
Installing the Ramp Onto the Pallet .......................................................... 2–3
3–1
Front Panel .............................................................................................. 3–1
3–2
Rear Panel (SCSI Connect) ..................................................................... 3–2
3–3
The Jukebox Control Panel....................................................................... 3–6
3–4
Control Panel Menu Tree ......................................................................... 3–9
4–1
The Autochanger Returns Suspect FRUs ................................................. 4–2
4–2
How Service Views the Suspect FRUs .................................................... 4–3
4–3
Information and Tests Through the SCSI Bus .......................................... 4–7
5–1
Right Lower Access Panel ....................................................................... 5–4
