Optiplex 3040 SFF Hard Drive upgrade

"I’m petty sure dell limits its hdd capacity to 2TB" untrue.

not true. at all,  the OS or drive format limits this, for sure on boot drives, more limited.

adding 2nd ,6TB drive, will work , if you format it GPT, first. when using windows,64bit its automatic.

ive no idea limits on 32bit (well 32 fails boot any GPT) the 32bit OS is long ago obsolete, in my world.

but 1st hit at MS dot com. see NON BOOTABLE HERE,

 you can in fact format non boot disk , w10 32/ or 64 to GPT of any size now or even year 2050

if dell has some secret limit , I can not know that or way, but would be wrong.

looks like you need space. to fit it to me. or lacks power cable to it inside. (did you look for power_)

any external drive works,  buy top grade case put it in and use it, even Esata .

space answered. your Cage is below,  are you asking what HDD 2.5" fits here, answer any .

what maters is why buy any 2.5" HDD at 6TB large,  many are not long lasting. (ask for best drives here)

 I’m petty sure dell limits its hdd capacity to 2TB

what is "IT"

the 2TB limit is for MBR format or using 32bit OS, NO OS STATED AT ALL.

500gb rust spinning HDD? 3.5" in it now. (put SSD here, if wise boot it. with SSD)

6 tb secondary nas type HDD  (no drive stated at all, 2.5" or 3.5" what driver did you buy or plan.

you only have 2 SATA ports, on mobo, blue is boot sata 0, cream is sata1.

are you asking for space inside? that it?

the only questions are where is the power cable for 2nd drive,  and space to put it.

you can in fact run an external hdd on any PC, for sure with PCI slots empty as seen below.

and SATA3 external port card, and eSTAT or USB3 card with external ports, sure can, on any PC made slots present.  what stops you? IDK

hello, read the manufacturer specs. 

Maximun space es 1TB

https://i.dell.com/sites/doccontent/shared-content/data-sheets/en/Documents/ecemea-optiplex-3040-technical-spec-sheet.pdf

I have a 240 gb ssd and I want to connect a 1TB hdd but i'm not sure if it's going to work.