After I've read Fullmetalbrackets's post: "How to find out when a Linux filesystem was created", I just found out...an interesting thing about UNIX culture: Everything has metadata.

If we research deeply, we will see something deep UNIX-like. The system contains more infor than what apprears on the surface.

There are tools of archaeology: tune2fs, dumpe2fs, blkid, debugfs

We feel Linux is digital archaeology.

They are not really meant for mass users. They are for:

- sysadmin

- forensis analysis

Many people even don't know own UUIDs, journals, and feature flags.

But in UNIX culture, a filesystem was never just a “C: drive.”

It was an object with internal structure.