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Operating Systems

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CPU Scheduling4

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Virtual Memory3

What a file actually is, and how directories find them
File allocation methods — where a file's actual bytes live on disk
Tracking free space, and surviving a sudden power loss
Putting it all together — the full journey of writing a file

Building Your Own OS in C++6

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Operating Systems

Foundations of Operating Systems3

Processes & Threads4

Inter-Process Communication3

Concurrency & Synchronization4

CPU Scheduling4

I/O & Disk Scheduling3

Memory Management4

Virtual Memory3

What a file actually is, and how directories find them
File allocation methods — where a file's actual bytes live on disk
Tracking free space, and surviving a sudden power loss
Putting it all together — the full journey of writing a file

Building Your Own OS in C++6

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File allocation methods — where a file's actual bytes live on disk

Three different strategies for tracking which disk blocks belong to which file, and the very familiar fragmentation trade-offs that reappear here too.

9 min readUpdated 2026-09-03operating-systemsfile-systemsdisk-blocksallocation