HP Netserver L Server series - Manual (Page 42)

Chapter 4 Installing Mass Storage
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5. Push the third drive part-way into its bay. Then slide the second and third
drives, together, all the way back into the server. Fasten the drives in
place with screws.
NOTE If you already have two drives in the server and are adding a
third, unfasten the retaining screws on the drive that is
adjacent to the empty drive bay. Pull the drive half-way out.
Then begin at Step 4.