diff --git a/content/notes/15-file-systems.md b/content/notes/15-file-systems.md
new file mode 100644
index 000000000..7717f574e
--- /dev/null
+++ b/content/notes/15-file-systems.md
@@ -0,0 +1,31 @@
+---
+title: "15-file-systems"
+aliases: 
+tags: 
+- cosc204
+- lecture
+---
+
+# what is a file
+an interface of OS to users
+
+os manages files just as files - it doesn't care what type of file it is - they are all bytes arranges logically in sequence.
+
+they are arrangges logically in sequence
+
+files need to be interpreted. THis is done by applications. e.g., powerpoint, ms paint, etc.
+
+
+- the OS provides a logical unit of storage for the user
+	- the user refers to files
+	- the operating system maps files onto regions of the storage
+	- files are really an artifact of the dialogue between the user and the OS
+
+# how to define it
+- a colle
+
+# file access pattersns
+# directory structure
+# file system implementation
+# disk allocation methods
+
diff --git a/content/notes/cosc-204.md b/content/notes/cosc-204.md
index 696d48c10..4140a09d3 100644
--- a/content/notes/cosc-204.md
+++ b/content/notes/cosc-204.md
@@ -40,6 +40,7 @@ tags:
 - [08-intro-to-c](notes/08-intro-to-c.md)
 - [11-struct-and-union](notes/11-struct-and-union.md)
 - [12-pointers-to-routines](notes/12-pointers-to-routines.md)
+- 
 
 # Archive