- File Structure
- =======
- 4: Size of Block Byte
- 4: Number of Blocks | BlockSize * NumberOfBlocks Must equal to Underlying Disk
- N: Block index table
- N: Dynamic allocated data blocks
- Block index entry 8 Bytes
- =======================
- 8: Compound bits
- Bit0~62: Offset of data block
- Bit63: Allocated flag
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