Prerequisites
Before you
install the DM5500 into the rack, you must remove all drives and
power supply units from the DM5500 due to the weight of the system.
CAUTION:When removing drives, it is very important to label each drive with its slot number so you can put each drive back into its correct position once the DM5500 is installed in the rack. If you do not put the drives back in the correct slots, the appliance may not function properly. It is recommended that you temporarily label each drive with its slot number using painter or gaffer tape as you remove each drive from the chassis. You should remove the drives in a top to bottom order.
Slots are numbered 0 through 23 in the two drive bays, and there is an imprint at the bottom of each bay denoting the slot number, as shown in the following image.
![This image shows the location of where the slot numbering imprints are located on the DM5500 drive bays.](https://dl.dell.com/content/guides/public/Html/pp-dm5500_5.15_ig/images/GUID-B6F269B3-6DA4-4480-B935-876EE50F8C6A-low.jpg)
To access the front drives for removal, you must
remove the bezel.
To access the middle drives in drive bay 2 for removal, you must
open the drive bay.
If your system contains drive blanks, follow the procedure to
remove drive blanks.
CAUTION:After you have completed the initial DM5500 appliance configuration that is described in this install guide, it is important to know that the drives specified in the PowerProtect Data Manager Appliance UI do not contain the physical slot number of the drive, but the logical slot number of the drive. Physical drive positions are numbered 0 through 23. Logical drive positions are numbered 1 through 24. For example, the disk drive that resides in physical slot 6 in the DM5500 server is specified as
Disk=7 in the PowerProtect Data Manager Appliance UI.