Adding and removing adapter cards and drives 6-3Working with the hardware in the system unitIf you have not removed the cover from your system unit, review “Safetyinformation” on page viii, and then see “Opening the system unit” on page 5-5.If you plan to add both an adapter card and a drive, install or replace the drivebefore you install or replace the adapter card. If you also plan to make hardwarechanges on the system board, see Chapter 7 and finish your work with the systemboard before continuing to work with the drives and adapter cards.To add or remove adapter cards or drives in the system unit, complete theinstructions in the following sections:• “Adding and removing adapter cards for desktop model” on page 6-4• “Adding and removing adapter cards for microtower model” on page 6-6• “Removing and adding drives” on page 6-7