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LVM-info structure layout
- Used by compatibility and LVM (JFS) volumes
- IBM name: Drive Letter Assignment Table
- Generic info in each DLAT sector:
- Disk geometry, diskname and disk-id value
- Boot-disk-id, sector CRC-value and install flags
- Partition specific information (max 4 entries):
- Start PSN of partition and size in sectors
- Volume-id and Partition-id values
- On-BM-menu flag and installable flag
- Volume and Partitions names (20-character max)
- Assigned driveletter, if any (zero if hidden)