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COMP 3413 Operating System
Task:
To work with the disk / disk image, use the low-level, unbuffered open, close, read, write, and lseek system calls. This will save you headaches, buffering, conversions, etc., and let you work on the byte level.
You have been provided with a Microsoft white paper on their FAT file systems (Fat12/16/32). You will only worry about the FAT32 implementation so you should use your discretion on reading. Also, pick your battles carefully in this document as not everything pertains to this assignment. You have been provided with a very minimal fat32.h file that provides a struct data structure for the boot sector. In addition to any other data structures you may need for your implementation, you will need to create similar structs for the FSInfo and fat32Dir types. Note the datatypes used instead of the standard int, etc. Why am I using those (you MUST use them)? Also note carefully the #pragma commands used and use them for any structures that you tie directly to reading from disk do these do and why are they important? This is a tricky one, and it requires that you have clear understanding of working with bits and bytes, data, memory, and casting in C. Before starting make sure that you are VERY clear on the difference between a byte, a sector, and a cluster, and how they relate. NOTE THAT these values vary by disk and how it was formatted, and cannot be hard coded. Don’t be shy to ask for help.
Feel free to make and test on your own diskimages using various tools (google). Make sure to test your program with large (>1GB) and small (
COMP 3413 Operating System
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