I couldn't check specifics of your system, because you didn't specify if it is Small Form Factor, Ultra Small Form Factor, or Mini-Tower. So, I'll give general advice for Optiplex family: If your system is UEFI with GPT disk, you can use drives up to 4 TB in size. If the system is legacy BIOS with MBR disk, you can use drives up to 2 TB in size. Dell's maximum memory and storage specifications are published at the time of system design, based on what they tested. It's not a limitation, so don't take it as gospel. Technology evolves, and often larger RAM sticks and larger drives become available after Dell publishes the specs, and Dell does not generally go back to revise the maximum specs. So, Dell's specs should not be interpreted as limitations or maximums. Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard. (Repeatedly touching a metal case part is not sufficient mitigation with modern components.)
Hi,   I've got a Dell Optiplex 9010 i7 3rd generation. Mother board is 0M9KCM, and manual only shows hard disk to 1 Tb, but not specify if it is the maximum capacity. Maximum RAM is specified clearly. I need more capacity. I've got 2 1Tb hard disks. Can I put a 2 or 4 Tb in my PC?   Thanks in advance
Maximum capacity hard disk in Optiplex 9010