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I tend to agree. I see databases as a type of file system with more strict constraints in terms of reading/writing.

One can maybe argue that file systems are just an address book and databases are a more much complicated address book.

Pedantically, it is the file system that is a type of database. Traditionally, database is the low-level generic term, referring to any type of structured data stored on a computer. File system, also known as the hierarchical database, adds additional specificity, referring to a particular structuring of data. Another common one is the relational database, offering another particular structuring of data.

LDAP and the Windows registry are hierarchical databases, just like a traditional file system, so the “file system = database” makes a lot of sense to me.

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