diff --git a/Algorithms/check drive capacity.pseudo b/Algorithms/check drive capacity.pseudo
new file mode 100644
index 0000000..1483750
--- /dev/null
+++ b/Algorithms/check drive capacity.pseudo	
@@ -0,0 +1,5 @@
+(USB_Location, Drive_Location)
+freeSpace <-- getCapacity(Drive_Location)
+driveFiles <-- getCapacity(USB_Location)
+if driveFiles > freeSpace then return True
+else return False
diff --git a/Algorithms/check drive is recorded.pseudo b/Algorithms/check drive is recorded.pseudo
new file mode 100644
index 0000000..93dc360
--- /dev/null
+++ b/Algorithms/check drive is recorded.pseudo	
@@ -0,0 +1,4 @@
+(DriveFormat, DriveName, DriveCapacity)
+result <-- ExecuteSQL("SELECT BackupName FROM backups WHERE driveFormat = {} AND DriveName = {} AND DriveCapacity = {};")
+if results is None then return False
+Else Return True
\ No newline at end of file
diff --git a/Algorithms/check if compression.pseudo b/Algorithms/check if compression.pseudo
new file mode 100644
index 0000000..56055af
--- /dev/null
+++ b/Algorithms/check if compression.pseudo	
@@ -0,0 +1,3 @@
+(BackupName, DriveName, DriveCapacity)
+wantsCompression <-- ExecuteSQL("SELECT isCompressed FROM backupTable WHERE driveName = {} AND BackupName = {} AND DriveCapacity = {}",  DriveName, BackupName, DriveCapacity)
+return wantsCompression
diff --git a/Algorithms/detect user logged in.pseudo b/Algorithms/detect user logged in.pseudo
new file mode 100644
index 0000000..c3d0292
--- /dev/null
+++ b/Algorithms/detect user logged in.pseudo	
@@ -0,0 +1,3 @@
+add c# user reference
+username <-- computer.UserName()
+return username
\ No newline at end of file
diff --git a/Algorithms/has drive changed since backup.pseudo b/Algorithms/has drive changed since backup.pseudo
new file mode 100644
index 0000000..d21c33e
--- /dev/null
+++ b/Algorithms/has drive changed since backup.pseudo	
@@ -0,0 +1,5 @@
+(backupName, driveLetter)
+driveHash <-- calculateHash(driveLetter)
+backupHash = ExecuteSQL("SELECT Hash FROM Backups WHERE backupName = {}", backupName)
+if backupName is driveHash then return False
+Else return True
\ No newline at end of file