M24 - Storage Architecture
Storage Architecture
Understand how disks, partitions, filesystems, and mount points fit together so storage changes make sense before any formatting or mounting commands are used.
- Explain the difference between a physical disk, a partition, and a filesystem.
- Explain what mounting means.
- Recognize why storage mistakes can destroy data if the model is unclear.
Why This Matters
Storage work becomes dangerous when people memorize commands without understanding the layers.
The safer approach is to understand the storage stack first:
- physical disk
- partition or volume layout
- filesystem created on top of that space
- mount point that makes it reachable through the OS
If that model is clear, later disk commands feel less like ritual and more like system design.
1. Disk, Partition, Filesystem, Mount
A physical disk is the storage device itself.
A partition is a defined section of storage on that disk.
A filesystem is the structure that organizes files and directories inside usable storage space.
A mount point is where the OS attaches that filesystem into the visible directory tree or drive view.
2. Why the Layers Matter
You cannot treat all storage actions as equivalent.
Examples:
- repartitioning changes how space is divided
- formatting creates or replaces a filesystem
- mounting makes an existing filesystem accessible at a chosen location
Those are different actions with different risks.
Most Important Safety Idea
Formatting and repartitioning can destroy existing data. Mounting usually does not destroy data by itself, but it changes how and where data becomes accessible.
3. Platform Framing
Windows often presents these ideas through disks, partitions, volumes, and drive letters, which can make the layers feel more hidden but they still exist.
Linux tends to expose the layers more directly: block devices, partitions, filesystems, and mount points inside the directory tree.
Different presentation, same underlying ideas.
What to Ignore for Now
- RAID levels in detail
- advanced filesystem internals
- low-level partition table recovery
The goal here is getting the basic storage map into your head before any hands-on changes.
Before You Move On
You are ready for the next lesson when you can explain:
- what the disk is
- what the partition or volume layer does
- what formatting means
- what mounting means
Next, we look at the GUI tools that visualize these layers more clearly.