Disk & Storage Commands

AI Summary

An AI-generated summary of this video lecture.

This lecture introduces Linux disk and storage commands, progressing from space inspection to filesystem management. The instructor begins by comparing `df -h` and `du -sh`, explaining that both use the `-h` flag for human-readable output. `df -h` reports filesystem-level disk space usage, showing columns such as Size, Used, Avail, Use%, and Mounted on. `du -sh` reports the total size of a directory tree; the `-s` flag means summary, and an example shows `1.2G /home/user/Documents`. The lesson then moves to mounting: `sudo mount /dev/sdb1 /mnt/data` attaches a partition or USB device to a directory, and the result is verified with `df -h | grep /mnt/data`, which displays `/dev/sdb1 100G 46G 55G 43% /mnt/data`. Finally, the slide covers `umount` for detaching filesystems and `fdisk -l` for listing disk partitions, with a warning that root privileges are required. The teaching flow is: inspect space, mount storage, verify the mount, unmount, and examine partitions.

Chapters

1. 0:00 – 2:00 00:00-02:00

   The opening slide, titled 'Disk & Storage Commands', presents a three-column table comparing `df -h` and `du -sh`. The instructor explains that `df -h` displays disk space usage in a human-readable format, while `du -sh` shows the total size of a directory. Terminal output for `df -h` lists filesystem sizes, used space, and mount points; `du -sh` output shows directory sizes such as Desktop, Documents, and Downloads. Red annotations begin to appear over the `df -h` command.

2. 2:00 – 5:00 02:00-05:00

   The instructor annotates the slide in detail. The `-h` flag is labeled 'human readable', and the `df -h` columns are described as disk file system size. Red boxes outline the Size, Used, Avail, Use%, and Mounted on columns in the terminal output. For `du -sh`, the `-s` flag is labeled 'summary', and the example shows `1.2G /home/user/Documents`. The lesson then transitions to mounting: a red underline highlights `sudo mount /dev/sdb1 /mnt/data`, and a red box surrounds the verification output from `df -h | grep /mnt/data`, which reads `/dev/sdb1 100G 46G 55G 43% /mnt/data`.

3. 5:00 – 6:47 05:00-06:47

   The final slide expands the table to include `mount`, `umount`, and `fdisk`. The instructor explains that `mount` attaches a filesystem (USB, partition, network share) to a directory using the syntax shown earlier. `umount` is presented for detaching filesystems, and `fdisk -l` is shown with the command `sudo fdisk -l` for listing disk partitions. A warning note emphasizes that root privileges are needed for these operations, and the instructor gestures while summarizing the workflow.

The lecture builds a practical sequence for managing Linux storage. First, `df -h` and `du -sh` are distinguished: `df` reports filesystem capacity, while `du` reports directory content size. Both rely on `-h` for human-readable units. Second, the `mount` command is taught with a concrete example: mounting `/dev/sdb1` to `/mnt/data` and verifying it by filtering `df -h` output with `grep`. Third, `umount` and `fdisk -l` complete the toolkit for detaching storage and inspecting partitions. The central takeaway is that root privileges are required for mount, unmount, and fdisk operations.