Dell Dimension 9100 - Manual (Page 22)

2. Press the tabs on each side of the drive towards each other and slide the drive up and out.
Installing a Hard Drive
1. Unpack the replacement hard drive, and prepare it for installation.
2. Check the documentation for the drive to verify that the drive is configured for your computer.
3. If your replacement hard drive does not have the hard drive bracket attached, remove the bracket from the old hard drive by unsnapping it from the
drive.
4. Snap the hard drive bracket onto the replacement hard drive.
5. Install the hard drive into the computer by sliding the drive into place until you feel it click into place.
6. Connect the power and SATA data cables to the hard drive.