Case Computer Notebook

¿I can take a 2.5 "external drive and put it in a laptop? Is there a problem doing this?
External drives (in cases) are often cheaper than bare 2.5 "drives internally. Then I can take a 2.5" external hard drive from its case and put it on a computer laptop? Is there an issue / warnings should be considered?
It should work. I have a 2.5 "external box, and often take the units laptop for use as external in the other direction should be fine.
Upgrading to the NZXT Phantom PHAN-001WT White Steel PC Case.