Introduction
These are the steps to remove the hard drive from the Precision Dell 5510, see the prerequisites for the back removal, and battery removal.
Tools
Parts
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            Open the system badge flap over to reveal the screws underneath (marked 1 on the image). 
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            Remove the 12 screws that secure the base cover to the computer. 
 
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            Remove the four 4.0 mm screws with a Phillips 1 screwdriver, and remove the hard drive bracket. 
 
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            Unplug the hard drive, and remove it. (We do not have a hard drive to be shown, but see image for where the hard drive would be unplugged from.) 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
According to the owner’s manual at https://www.dell.com/support/manuals/en-..., most of the screws for the base cover are Torx #5 with a couple of Phillips #0 under the badge flap.
KCMax -