Dell OptiPlex 755 User's Guide - Page 146
Replacing a Second Hard Drive, Disconnect cable from the existing hard drive.
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Replacing a Second Hard Drive For information on RAID configuration, see "About RAID Configurations" on page 295. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the computer cover. NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a foam pad, that will sufficiently cushion it. NOTICE: If you are replacing a hard drive that contains data you want to keep, back up your files before you begin this procedure. NOTE: Installation of a second hard drive is restricted to certain configurations of the Desktop computer. 1 Check the documentation for the drive to verify that it is configured for your computer. 2 Follow the procedures in "Before You Begin" on page 21. 3 Remove the computer cover (see "Removing the Computer Cover" on page 90). 4 Remove the optical drive (if your configuration has one). See "Removing an Optical Drive" on page 131. 5 Disconnect cable from the existing hard drive. 6 Remove the existing hard drive from the computer (see "Removing a Hard Drive" on page 142). 7 Remove screws from the existing hard drive and install them on the new hard drive. 8 Carefully slide the new hard drive into the upper bay until it clicks into place. 9 Insert reconnect the cable to the drive. 146 Drives