Dell Vostro 1088 (Mid 2009) - Manual (Page 16)

5. Pull the plastic tab toward the opposite end of the hard drive assembly to disengage the hard drive interposer from the connector on the system board,
then lift the hard drive assembly from the computer.
Replacing the Hard Drive Assembly
Perform the steps described above in reverse order to replace the hard drive in your computer.
Removing the Hard Drive Bracket
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the battery from the computer.
3. Remove the access panel from the computer.
4. Remove the hard drive from the computer.