Can I insert a non-SSD drive in place of SSD in a laptop?

[grr]

Hello Friends,
I need help deciding if I can replace existing SSD (120GB) with a non-SSD (1TB) drive in laptop.

Laptop model is below
Hp Elitebook 840 G2 14" Notebook - Intel Core I5 I5-5300u Dual-Core (2 Core) 2.30 Ghz - 8 Gb Ddr3l Sdram Ram - 128 Gb Ssd - 16:9 Display - Gigabit Ethernet - 4 X Total Usb Ports - 4 X Usb 3.0 Ports - Network (Rj-45) - Headphone/Microphone Combo Port M2f64up#aba

http://www.compsource.com/pn/M2F64UPABA/Hewlett-Packard-Hp-195/Elitebook-840-G2-Notebook-Pc-M2f64upaba/

I have never worked with any SSD and hence am completely illiterate on what and how SSD works and connects to Motherboard. :huh: :(

As 120GB is too less for me, I want to get a bigger hard disk. However, a 1TB SSD is way too costly for me to even think about buying. Therefore, I thought if I could replace it with a non-SSD drive.


I have attached folloowing documents for someone to have a check and suggest me.
HP EliteBook 840 G2 Notebook PC -QuickSpecs
HP EliteBook 840 G2 Notebook PC Datasheet


Thanks, Grr