IBM Power System 9040-MR9 Manual page 24

Figure 5. Installing a drive in a system
Important: Ensure that the drive is fully seated and is all the way into the system.
5. Continue with step "9" on page 12.
6. To install or replace a drive in the front of the system or enclosure by using the AIX operating system,
complete the following steps:
a) Unlock the drive bay handle (A) by pressing the handle release latch and pulling out the handle. If
the handle is not all the way out, the drive does not slide into the system.
b) Hold the drive by the top and bottom edges as you position the drive, and prepare to insert it into
the drive slot.
c) Slide the drive all the way into the system, and push in the drive handle (A) until it locks.
10 Power Systems: Disk drives or solid-state drives