Dell OptiPlex G1 - Manual (Page 84)

Drive Hardware Removal (Mini Tower Chassis): Dell ™ OptiPlex ™ G1 Systems
Drive Hardware | 3.5-Inch Diskette Drive Removal | 5.25-Inch Drive Assembly Removal | Hard-Disk Drive Bracket Removal | Hard-Disk Drive Assembly Removal
Drive Hardware
3.5-Inch Diskette Drive Removal
To remove a 3.5-inch diskette drive assembly, follow these steps:
1. Disconnect the DC power cable and the interface cable from the back of the 3.5-inch diskette drive.
2. Press the retaining-tab release button, and pull the drive assembly forward to remove it.
3. Remove the drive-mounting screw from the left side of the drive, and remove the drive from the bracket.