Chapter 6. Theory of Operation
EK–MOL80–SV. B01
6–21
User Zone Layout
The User Zone consists of Defect Management Areas (DMAs), a User Area and
a Slipping Area. The DMAs contain information on the organization of the User
Area into User Groups and Spare Groups. The DMAs also contain a Primary
Defect List (PDL) and a Secondary Defect List (SDL) that provide information
on the locations of defects. The drive uses this information to perform defect
management.
Although the User Zone consists of tracks and sectors, it is often easier to think
of it in terms of a large memory space of consecutive sectors. Figure 6–9 shows
the following parts of the User Zone for 650-Mbyte media.
1. Four Defect Management Areas (DMAs) each consisting of a:
•
Disk Definition Structure (DDS),
•
Primary Defect List (PDL),
•
Secondary Defect List (SDL)
2. Slipping Area (650-Mbyte disks only).
3. User Area consisting of:
•
g User Groups, of n sectors each
•
g Spare Groups, of m sectors each.
650-Mbyte Disk and Spare Groups
Figure 6–9 shows the User Zone Layout for 650-Mbyte disks. The values for g,
m, and n are variable depending on how the disk is formatted.
1.3-Gbyte Disk User and Spare Groups
Figures 6–10 and 6–11 show the User Zone Layout for 1.3 Gbyte, for both g=1
(single data area and one more spare area) and g=16 (16 data areas and 16 spare
areas, respectively. It is important to note one significant difference between
650-Mbyte and 1.3-Gbyte media. Both types of media can contain multiple
groups, however the start of each group on 650-Mbyte media can “split out” with
any split spares found PRIOR to that group. The 1.3-Gbyte media establishes
groups BEFORE accounting for slip spares. (Please refer to the section on Drive
Defect Management for more details).
Содержание RW551
Страница 27: ...Medium Optical Disk RW551 RW552 Library 3 2 EK MOL80 SV B01 Figure 3 2 Rear Panel SCSI Connect...
Страница 34: ...Chapter 3 Product Configuration and Operation EK MOL80 SV B01 3 9 Figure 3 4 Control Panel Menu Tree...
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Страница 139: ...Chapter 5 Removal and Replacement EK MOL80 SV B01 5 47 Figure 5 49 Jukebox Exploded View 1 of 2...
Страница 140: ...Medium Optical Disk RW551 RW552 Library 5 48 EK MOL80 SV B01 Figure 5 49 Jukebox Exploded View 2 of 2...
Страница 141: ...Chapter 5 Removal and Replacement EK MOL80 SV B01 5 49 Figure 5 50 Jukebox Power Harness...
Страница 142: ...Medium Optical Disk RW551 RW552 Library 5 50 EK MOL80 SV B01 Figure 5 51 Jukebox Pulley and Rope Diagram...
Страница 166: ...Chapter 6 Theory of Operation EK MOL80 SV B01 6 23 Figure 6 10 User Zone Layout for 1 3 Gbyte Media g 1...
Страница 167: ...Medium Optical Disk RW551 RW552 Library 6 24 EK MOL80 SV B01 Figure 6 11 User Zone Layout for 1 3 Gbyte g 16...
Страница 168: ...Chapter 6 Theory of Operation EK MOL80 SV B01 6 25 Figure 6 12 User Zone Layout for 2 6 Gbyte Media 1 024 bytes sector...
