FAT Root Directory
※ directory entry, clusters, FAT structure
EX) FAT structure 실습
부트코드 점프명령어 = EB 3C 90
OEM Name = 6D 6B 64 6F 73 66 73 00 = mkdosfs
Byte Per Sector = 00 02 -> 02 00 -> 512byte
Sector Per Cluster = 01
01 00 -> 예약된 섹터수 00 01 -> 1개
02 -> FAT 영역의 수 2개
Root Directory Entry 개수 = 00 02 -> 02 00 -> 512개
볼륨 총 섹터수 = 00 78 -> 78 00 -> 30720개
F8 -> HDD (하드디스크 볼륨)
77 00 -> 00 77 -> FAT 섹터수 119개
<중요>
Root Directory의 시작 섹터 = 예약된 섹터수 + FAT 섹터수 * FAT 영역의 수
-> 239 = 1 + 119 * 2
# Root Directory
Entry #1
-File Name: FILE1.DAT
-First Cluster: 2
-File Size: 512
-Cluster Chain: 2 -> EOF
-특이사항: 없음
Entry #2
-File Name: FILE2.DAT
-First Cluster: 3
-File Size: 90 01 00 00 -> 00 00 01 90 -> 400
-Cluster Chain: 3 -> EOF
-특이사항: 없음
Entry #3
-File Name: FILE3.DAT
-First Cluster: 4
-File Size: 84 03 00 00 -> 00 00 03 84 -> 900
-Cluster Chain: 4 -> 5 (next cluster) -> EOF
-특이사항: 없음
Entry #4
-File Name: FILE4.DAT
-First Cluster: 6
-File Size: 77 02 00 00 -> 00 00 02 77 -> 631
-Cluster Chain: 6 -> 8 -> EOF
-특이사항: 없음
Entry #5
-File Name: FILE5.DAT
-First Cluster: 7
-File Size: 00 02 00 00 -> 00 00 02 00 -> 512
-Cluster Chain: 7 -> 00 -> Free Cluster 결론: EOF
-특이사항: 삭제된파일 , 앞의문자 깨짐
Entry #6
-File Name: FILE6.DAT
-First Cluster: 9
-File Size: B6 02 00 00 -> 00 00 02 B6 -> 694
-Cluster Chain: 9 -> 11 -> EOF
-특이사항: 없음
Entry #7
-File Name: FILE7.DAT
-First Cluster: 10
-File Size: 00 02 00 00 -> 00 00 02 00 -> 512
-Cluster Chain: 10 -> EOF
-특이사항: 없음
Entry #8
-File Name: SECOND
-First Cluster: 12
-File Size: 512
-Cluster Chain: 12 -> EOF
-특이사항: 없음