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The LDA format is a hybrid that uses disk image structures (directory and data blocks) to support disk functions, plus a free-nodes list to replace the BAM, plus an initial 512 byte header that leads the rest of the image. Directory blocks are not relegated to a single location; rather, directory block 0 is adjacent to the header, and blocks are scattered throughout the image as needed.

This format is geared for data storage, although it could be used in a read-write context, but it's primary design purpose is for a flexible but familiar file storage mechanism.