سجل الإقلاع الرئيسي
تقسيم القرص

اي بي ام قامت بانشاء الأمر الخدمي المشهور اف ديسك FDISK لتركيب وصيانة سجل الإقلاع الرئيسي.
عندما يتم تقسيم القرص بناء على المخطط اف ديسك أو غيره، فإن سجل الإقلاع الرئيسي يوضع فيه جدول التقسيم والذي يصف عديد من الأشياء منها بداية ونهاية كل قسم وحجم القسم والعديد من المواصفات الأخرى.
أما الأقسام نفسها فيمكن أن تحتوي أيضا على بيانات لوصف أكبر لمخططات التقسيم الأكثر تعقيدا مثل سجل الإقلاع الموسع Extended boot records (EBRs)، وتسميات القرص BSD disklabels، أو البيانات الوصفية لمدير القرص المنطقي Logical Disk Manager metadata.
| Address> Hex | Address> Dec | الوصف | الوصف | المساحه بالبايت |
| --- | --- | --- | --- | --- |
| +000h | +0 | Bootstrap code area | Bootstrap code area | 446 |
| +1BEh | +446 | Partition entry #1 | Partition table (for primary partitions) | 16 |
| +1CEh | +462 | Partition entry #2 | Partition table (for primary partitions) | 16 |
| +1DEh | +478 | Partition entry #3 | Partition table (for primary partitions) | 16 |
| +1EEh | +494 | Partition entry #4 | Partition table (for primary partitions) | 16 |
| +1FEh | +510 | 55h | Boot signature | 2 |
| +1FFh | +511 | AAh | Boot signature | 2 |
| Total size: 446 + 4*16 + 2 | Total size: 446 + 4*16 + 2 | Total size: 446 + 4*16 + 2 | Total size: 446 + 4*16 + 2 | 512 |
| Address> Hex | Address> Dec | الوصف | الوصف | المساحه بالبايت |
| --- | --- | --- | --- | --- |
| +000h | +0 | Bootstrap code area (part 1) | Bootstrap code area (part 1) | 218  |
| +0DAh | +218 | 0000h | Disk timestamp (optional, MS-DOS 7.1-8.0 (Windows 95B/98/98SE/ME), alternatively can serve as OEM loader signature with NEWLDR) | 2 |
| +0DCh | +220 | original physical drive (80h etc.) | Disk timestamp (optional, MS-DOS 7.1-8.0 (Windows 95B/98/98SE/ME), alternatively can serve as OEM loader signature with NEWLDR) | 1 |
| +0DDh | +221 | seconds (0..59) | Disk timestamp (optional, MS-DOS 7.1-8.0 (Windows 95B/98/98SE/ME), alternatively can serve as OEM loader signature with NEWLDR) | 1 |
| +0DEh | +222 | minutes (0..59) | Disk timestamp (optional, MS-DOS 7.1-8.0 (Windows 95B/98/98SE/ME), alternatively can serve as OEM loader signature with NEWLDR) | 1 |
| +0DFh | +223 | hours (0..23) | Disk timestamp (optional, MS-DOS 7.1-8.0 (Windows 95B/98/98SE/ME), alternatively can serve as OEM loader signature with NEWLDR) | 1 |
| +0E0h | +224 | Bootstrap code area (part 2, code entry at +000h) | Bootstrap code area (part 2, code entry at +000h) | 216  (max. 222) |
| +1B8h | +440 | 32-bit disk signature | Disk signature (optional, Windows NT/2000/Vista/7 and other OSes) | 4 |
| +1BCh | +444 | 0000h | Disk signature (optional, Windows NT/2000/Vista/7 and other OSes) | 2 |
| +1BEh | +446 | Partition entry #1 | Partition table (for primary partitions) | 16 |
| +1CEh | +462 | Partition entry #2 | Partition table (for primary partitions) | 16 |
| +1DEh | +478 | Partition entry #3 | Partition table (for primary partitions) | 16 |
| +1EEh | +494 | Partition entry #4 | Partition table (for primary partitions) | 16 |
| +1FEh | +510 | 55h | Boot signature | 2 |
| +1FFh | +511 | AAh | Boot signature | 2 |
| Total size: 218 + 6 + 216 + 6 + 4*16 + 2 | Total size: 218 + 6 + 216 + 6 + 4*16 + 2 | Total size: 218 + 6 + 216 + 6 + 4*16 + 2 | Total size: 218 + 6 + 216 + 6 + 4*16 + 2 | 512 |