![]() ![]() The number of sectors per element of the FAT table. It is now changed to 0 (0000h) and is ignored on FAT32 drives. ![]() For hard drives, this value was always 512 (0200h) and meant the number of directory lines located in thirty-two sectors. This item reports the number of sectors in the root directory. By adding or multiplying the values \u200b\u200bof these parameters, the operating system knows where the FAT table is located, the root directory, where the data area begins and ends. It contains the physical characteristics of the disk that MS-DOS and Windows use when searching for a specific region. Note.This portion of the boot sector is known as the BIOS Parameter Block (BPB). The total number of sectors if the disk size is more than 32 MBĭisc number in this case 80, which identifies the main section Number of sectors per element of the FAT table Total number of sectors (00 00 - if the disk size is more than 32 MB)Įnvironment descriptor in this case F8, which identifies the drive as hard with any capacity Number of elements in the root directory (maximum limit) Number of reserved sectors before the first FAT Number of sectors per cluster (always a multiple of two to the power of n) The most important records in the boot sector The changes made to BPB to support FAT32 are described below. It contains the same structures as the standard BPB, but includes a few additional fields that are required for FAT32. BF_BPB is an extended version of the BPB found in 12- and 16-bit FAT. Because of this, the boot sector now occupies not one, but three physical sectors, and there is an additional one and is located through three physical sectors in the seventh, eighth and ninth physical sectors. The EAT32 BIOS parameter block takes up more space than the standard one and is called the Big FAT BIOS Parameter Block (BF_BPB). The number of reserved sectors is now 32 before the first FAT. Boot sector changes Number of reserved sectors Below Table 5 explains some of its most important entries. Its data block (512 bytes) begins with a JMP command that transfers control to the IPL2 program, contains the name of the operating system and its version, contains the disk BIOS parameter block (BPB), the IPL 2 program that loads the operating system, and ends with the signature 55AA. ![]() The boot sector on any logical disk (partition) is located first. At the stage of logical formatting of each partition (logical disk), four logical areas are created: ![]()
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