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For details of these two API, please refer to the MSDN documentation. (This is the boot sector for a floppy formatted with FAT.) This step can be achieved with two WIN32 APIs, “CreateFile()” and “ReadFile()”. The next step is to open the device and read sector zero. Now, the structure is ready to hold data from the boot sector.
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So, I have created one structure as shown below: Your next step will be to create a equivalent data structure in C++ to hold data read from the boot structure. Number of sectors in file system(32-bit value, not applicable for floppy).īoot Code, otherwise contains information to replace disk.įrom the above mentioned table, you got the boot sector information for a floppy disk formatted with FAT.
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Number of sectors before start of partition(Not applicable for floppy). Sectors allocated for each File allocation table. Media Type(According to Microsoft 0xf8 for fixed disk and 0xf0 for removable disk. Maximum entries possible under root directory. Data Structure for FAT Boot Sector Byte Range Before starting to dig in this area, please refer to the FAT specification as mentioned by Microsoft at. Out of these 512 bytes, the first 36 bytes contain important information about floppy disk geometry. In this article, you will learn how to interpret this data to get floppy disk geometry.Īs I mentioned before, the boot sector size for a floppy disk is 512 bytes. In the FAT file system, the boot code is closely interwoven with the file system. The size of the boot sector will always be 512 bytes for a floppy formatted with FAT. The boot sector in a floppy disk resides in sector zero (0) of the disk. This article explains the structure of the BOOT sector of a floppy disk, which is formatted in the Windows environment for the FAT File System.
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